Glass in building - Coated glass - Part 2: Requirements and test methods for class A, B and S coatings

This European Standard specifies requirements and test methods related to artificial weathering and abrasion of coatings on glass for use in buildings.
These tests are aimed at evaluating the resistance of the coating to attack by simulated natural weathering conditions as well as to abrasion. This attack can be considered as representative of that which could be found on the external and/or internal face of the glazing.
This European Standard applies to Class A, B and S coatings, as described in EN 1096-1.

Glas im Bauwesen - Beschichtetes Glas - Teil 2: Anforderungen an und Prüfverfahren für Beschichtungen der Klassen A, B und S

Diese Europäische Norm legt Anforderungen und Prüfverfahren für die Beständigkeit gegen simulierte Witterungsbedingungen und gegen Abrieb für Beschichtungen auf Glas für Anwendung im Bauwesen fest. Diese Prüfungen sind für die Beurteilung der Beständigkeit von Beschichtungen gegen Einwirkungen von simulierten natürlichen Witterungsbedingungen und gegen Abrieb vorgesehen. Diese Einwirkungen entsprechen den Einflüssen, die an der äußeren und/oder inneren Seite der Verglasung tatsächlich auftreten können. Diese Europäische Norm ist, wie in EN 1096-1 festgelegt, auf Beschichtungen der Klassen A, B und S anwendbar.

Verre dans la construction - Verre à couche - Partie 2: Exigences et méthodes d'essai pour les couches de classes A, B et S

La présente Norme européenne spécifie les exigences et méthodes d’essai de la résistance au vieillissement climatique artificiel et à l’abrasion applicables au verre à couche employé dans la construction.
Ces essais ont pour objectif d’évaluer la résistance de la couche aux attaques dans des conditions simulées de vieillissement climatique naturel ainsi que sa résistance à l’abrasion. Ces attaques peuvent être considérées comme représentatives de celles qui pourraient affecter la face extérieure et/ou intérieure du vitrage.
La présente Norme européenne s’applique aux couches de classes A, B et S telles que définies dans l’EN 1096-1.

Steklo v gradbeništvu - Steklo z nanosi - 2. del: Zahteve in preskusne metode za nanose razredov A, B in S

Ta evropski standard določa zahteve in preskusne metode v zvezi z umetno izpostavljenostjo vremenskim vplivom in abrazijo nanosov na steklu, ki se uporablja v gradbeništvu. Cilj teh preskusov je ovrednotiti odpornost nanosa na napad s simuliranimi razmerami naravne izpostavljenosti vremenskim vplivom in abrazijo. Ta napad bi lahko predstavljal to, kar je mogoče najti na zunanji in/ali notranji površini nanosa. Ta evropski standard se uporablja za nanose razredov A, B in S, kot je opisano v standardu EN 1096-1.

General Information

Status
Withdrawn
Publication Date
29-Apr-2012
Withdrawal Date
30-Jul-2012
Current Stage
9060 - Closure of 2 Year Review Enquiry - Review Enquiry
Start Date
02-Sep-2017
Completion Date
02-Sep-2017

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklo v gradbeništvu - Steklo z nanosi - 2. del: Zahteve in preskusne metode za nanose razredov A, B in SGlas im Bauwesen - Beschichtetes Glas - Teil 2: Anforderungen an und Prüfverfahren für Beschichtungen der Klassen A, B und SVerre dans la construction - Verre à couche - Partie 2: Exigences et méthodes d'essai pour les couches de classes A, B et SGlass in building - Coated glass - Part 2: Requirements and test methods for class A, B and S coatings81.040.20Steklo v gradbeništvuGlass in buildingICS:Ta slovenski standard je istoveten z:EN 1096-2:2012SIST EN 1096-2:2012en,fr,de01-april-2012SIST EN 1096-2:2012SLOVENSKI

STANDARDSIST EN 1096-2:20011DGRPHãþD
SIST EN 1096-2:2012
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1096-2
January 2012 ICS 81.040.20 Supersedes EN 1096-2:2001English Version

Glass in building - Coated glass - Part 2: Requirements and test methods for class A, B and S coatings

Verre dans la construction - Verre à couche - Partie 2: Exigences et méthodes d'essai pour les couches de classes A, B et S

Glas im Bauwesen - Beschichtetes Glas - Teil 2: Anforderungen an und Prüfverfahren für Beschichtungen der Klassen A, B und S This European Standard was approved by CEN on 3 December 2011.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1096-2:2012: ESIST EN 1096-2:2012

EN 1096-2:2012 (E) 2 Contents Page Foreword ..............................................................................................................................................................41 Scope ......................................................................................................................................................52 Normative references ............................................................................................................................53 Terms and definitions ...........................................................................................................................54 Requirements .........................................................................................................................................55 Samples and test pieces .......................................................................................................................75.1 Preparation .............................................................................................................................................75.1.1 Coated annealed glass ..........................................................................................................................75.1.2 Thermally treated coated glass ............................................................................................................75.1.3 Coated toughened or heat strengthened glass ..................................................................................85.2 Storage ....................................................................................................................................................85.3 Marking ...................................................................................................................................................86 Initial evaluation of test pieces .............................................................................................................86.1 Preparation .............................................................................................................................................86.2 Visual inspection ...................................................................................................................................86.3 Spectrophotometric measurements ....................................................................................................86.3.1 Coated annealed glass ..........................................................................................................................86.3.2 Toughened or heat strengthened coated glass ..................................................................................97 Duration of the tests ..............................................................................................................................98 Test methods ..........................................................................................................................................98.1 General ....................................................................................................................................................98.2 Positioning of test pieces in the test cabinets ................................................................................ 109 Final evaluation of test pieces ........................................................................................................... 119.1 General ................................................................................................................................................. 119.2 Cleaning ............................................................................................................................................... 119.3 Visual Inspection ................................................................................................................................ 129.4 Spectrophotometric measurements ................................................................................................. 129.4.1 Coated annealed glass ....................................................................................................................... 129.4.2 Thermally treated coated glass ......................................................................................................... 1210 Test report ........................................................................................................................................... 13Annex A (normative)

Special procedures for thermally treated coated glass ........................................... 15A.1 General ................................................................................................................................................. 15A.2 Samples and test pieces for chemical and abrasion tests .......................................................... 15A.3 Spectrophotometric measurements ................................................................................................. 15A.3.1 Samples and test pieces for spectrophotometric measurements ................................................. 15A.3.2 Procedures .......................................................................................................................................... 15Annex B (normative)

Determination of the condensation resistance ....................................................... 17B.1 General ................................................................................................................................................. 17B.2 Procedure ............................................................................................................................................ 17B.3 Test cabinet ......................................................................................................................................... 17Annex C (normative)

Determination of the resistance to acid .................................................................... 19C.1 General ................................................................................................................................................. 19C.2 Procedure ............................................................................................................................................ 19C.3 Test cabinet ......................................................................................................................................... 19Annex D (normative)

Determination of the resistance to neutral salt spray .............................................. 21SIST EN 1096-2:2012

EN 1096-2:2012 (E) 3 D.1 General ................................................................................................................................................. 21D.2 Apparatus ............................................................................................................................................. 21D.2.1 Spray cabinet ....................................................................................................................................... 21D.2.2 Heater and temperature control ......................................................................................................... 21D.2.3 Spraying device ................................................................................................................................... 21Annex E (normative)

Determination of resistance to abrasion

................................................................... 22E.1 General ................................................................................................................................................. 22E.2 Apparatus ............................................................................................................................................. 22E.2.1 General ................................................................................................................................................. 22E.2.2 Metal finger .......................................................................................................................................... 22E.2.3 Abrasive felt ......................................................................................................................................... 22E.3 Test piece ............................................................................................................................................. 23E.4 Test procedure ..................................................................................................................................... 23Annex F (normative)

Criteria to demonstrate equivalence of coatings ...................................................... 25F.1 General ................................................................................................................................................. 25F.2 Composition of coatings .................................................................................................................... 25F.3 Previous test reports ........................................................................................................................... 25F.4 Evaluation............................................................................................................................................. 25F.5 Examples .............................................................................................................................................. 25Annex G (informative)

Summary of test report .............................................................................................. 27Bibliography ...................................................................................................................................................... 29 SIST EN 1096-2:2012

EN 1096-2:2012 (E) 4 Foreword This document (EN 1096-2:2012) has been prepared by Technical Committee CEN/TC 129 “Glass in building”, the secretariat of which is held by NBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2012, and conflicting national standards shall be withdrawn at the latest by July 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1096-2:2001. The main changes compared to the previous edition are:

 reference to the future EN 1096-5, Test method and classification for the Self-cleaning performances of coated glass surfaces;

 the introduction of a method to deal with toughenable / heat strengthenable and to be toughened / to be heat strengthened coated glass, see Annex A. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

SIST EN 1096-2:2012

EN 1096-2:2012 (E) 5 1 Scope This European Standard specifies requirements and test methods related to artificial weathering and abrasion of coatings on glass for use in buildings. These tests are aimed at evaluating the resistance of the coating to attack by simulated natural weathering conditions as well as to abrasion. This attack can be considered as representative of that which could be found on the external and/or internal face of the glazing. This European Standard applies to Class A, B and S coatings, as described in EN 1096-1. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 410, Glass in Building — Determination of luminous and solar characteristics of glazing EN 1096-1:2012, Glass in building — Coated glass — Part 1: Definitions and classification. EN 12898, Glass in building — Determination of emissivity 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1096-1 apply. 4 Requirements The coated glass complying with this European Standard shall respect the requirements related to the different characteristics given in Table 1. SIST EN 1096-2:2012

EN 1096-2:2012 (E) 6

Table 1 — Requirements Characteristics Test Method Requirements Visual Inspection Spectrophotometric measurements Condensation resistance Annex B - No defect, as defined in EN 1096-1, greater than 3 mm length - Maximum one defect between 2 mm and 3 mm length - Maximum five defects between 1 mm and 2 mm length In addition, no scratches, staining of the coating or clusters of pinholes greater than 1 mm shall be allowed (see EN 1096-1). When compared with the reference test piece, in both reflection and transmission, there shall be no significant colour change. This observation shall be made within 20 sa

. The transmittance measured at 550 nm and 900 nm shall differ by no more than ± 0,03 from the corresponding measured value on the reference test piece.

For a glass claimed to have a low emissivity coating the reflectance at 8 µm shall decrease by no more than 0,02. Acid resistance Annex C No requirements Neutral salt spray resistance Annex D - No defect, as defined in EN 1096-1, greater than 3 mm length - Maximum one defect between 2 mm and 3 mm length - Maximum five defects between 1 mm and 2 mm length In addition, no scratches, staining of the coating or clusters of pinholes greater than 1 mm shall be allowed (see EN 1096-1). When compared with the reference test piece, in both reflection and transmission, there shall be no significant colour change. This observation shall be made within 20 sa

. Abrasion resistance Annex E No requirement other than to ensure that the abraded area is uniform Total (diffuse plus direct) transmittance measured at 550 nm and 900 nm shall differ by no more than ± 0,05 from the corresponding value measured for the reference test piece. a The time for observation is fixed to 20 s in order to have a reference period which can influence the visual inspection.

SIST EN 1096-2:2012
EN 1096-2:2012 (E) 7 5 Samples and test pieces

5.1 Preparation 5.1.1 Coated annealed glass A sample of 300 mm x 300 mm is needed for each test. For the three chemical durability tests, the test pieces are obtained by cutting the sample as shown in Figure 1. The abrasion test is undertaken on a

300 mm x 300 mm test piece. It is recommended that a spare sample be supplied in the event of one sample not being defect free.

Key 1. test pieces 2. reference test piece for visual inspection 3. reference test piece for spectrophotometric measurement Figure 1 — Plan for cutting a sample into test pieces 5.1.2 Thermally treated coated glass For the thermally treated coated glass, defined in EN 1096-1:2012, 3.1.8 to 3.1.11, as the test pieces cannot be cut from test samples, a special procedure has to be employed to obtain the test pieces (see Annex A). SIST EN 1096-2:2012

EN 1096-2:2012 (E) 8 5.1.3 Coated toughened or heat strengthened glass Use coated annealed glass samples for testing this type of coated glass. 5.2 Storage The test pieces shall be stored inside a room at a temperature of (23 ± 5) °C with a relative humidity less than 80 %. Storage shall prevent dust, chemicals or condensation reacting with the test pieces. The test pieces shall not be stored for more than three months before performing the test.

5.3 Marking The test pieces shall be marked on the uncoated glass surface. The following information shall be marked:  manufacturers' coating reference  test pieces number 1 to 4  code for test Glasses with coating on both surfaces shall be marked without damaging the coating. The two reference test pieces shall be marked as the test pieces plus "ref". 6 Initial evaluation of test pieces

6.1 Preparation All test pieces shall be cleaned with demineralised water and with a soft tissue. Drying shall also be done with a soft tissue. If necessary this cleaning procedure can be repeated. 6.2 Visual inspection The test pieces shall be subjected to a visual inspection under an artificial sky in accordance with EN 1096-1. The inspection shall take place in both transmission and reflection. The test pieces shall be observed at a distance of 600 mm. All test pieces shall be defect free. No scratches or pinholes shall be observed. If a test piece contains defects it shall be replaced. NOTE The replacement of test pieces is to avoid any misinterpretation of the testing results. 6.3 Spectrophotometric measurements 6.3.1 Coated annealed glass A measurement sample shall be cut from the centre of the reference test piece. The actual size shall be dependent on the type of equipment being used for the measurements. The transmittance of the measurement sample shall be measured with radiation of normal incidence at the following wavelengths:  550 nm (representative wavelength for light and solar transmittance);  900 nm (representative wavelength for solar transmittance). For glass claiming to have a low emissivity coating a measurement of the reflectance shall be made at 8 µm using radiation of nearly normal incidence. SIST EN 1096-2:2012

EN 1096-2:2012 (E) 9 6.3.2 Toughened or heat strengthened coated glass As the measurement sample cannot be cut from the reference test piece, a special procedure has to be employed to make the measurement (see Annex A). 7 Duration of the tests The durations of the tests are set out in Table 2. Table 2 — Duration of the tests Test Test duration for class A B S Condensation resistance Acid resistance Neutral salt spray Abrasion resistance 21 days 5 cycles 21 days 500 strokes 4 days 1 cycle 10 days 50 strokes 14 days 5 cycles a

500 strokes a The neutral salt spray test is excluded for Class S coatings as they are subject to frequent cleaning in the applications for which theyare used in accordance with EN 1096-1.

8 Test methods 8.1 General The coated glass complying to this part of the European Standard shall pass the tests given in Annexes B, C, D and E which are designed to verify the chemical and mechanical characteristics of the coating. The tests are as follows:  condensation resistance test (see Annex B)  acid resistance test (see Annex C)  neutral salt spray test (see Annex D)  abrasion resistance test (see Annex E) These tests are evaluated by their effect on the visual quality of the product and its spectrophotometric properties. Whilst it would be feasible to evaluate the spectrophotometric properties across the entire spectrum, a number of representative wavelengths have been selected. These wavelengths represent transmission of light and energy, together with reflectance relating to emissivity, where appropriate. SIST EN 1096-2:2012

EN 1096-2:2012 (E) 10 Each test shall be carried out without interruption. The only exception is the acid resistance test which can be interrupted after each cycle. However, any interruption shall not exceed three days. Testing shall start as soon as possible after the test pieces have been cleaned. The exception is the abrasion resistance test where testing shall commence within 30 min of the test piece being cleaned. Care shall be taken to ensure the test pieces are clean and uncontaminated.

8.2 Positioning of test pieces in the test cabinets The test pieces shall have their coated side oriented upwards, the pieces presenting an angle of (15 ± 5)° with the vertical, and the coated side shall face away from the door. For consistent results, a certain quantity of glass shall be present. For 300 l cabinet the total weight of the glasses shall be (7,5 ± 0,5) kg. An insufficient quantity of coated glass shall be compensated with uncoated clear glasses. In the centre of the test pieces a piece of 6 mm clear glass is placed, with the reference thermocouple attached (see Figure 2). The following spacing shall be maintained:  distance from the walls not less than 100 mm  distance between bottom of the test pieces and water not less than 200 mm  spacing between adjoining test pieces not less than 20 mm

not more than 40 mm Where there is an insufficient quantity of coated glass for testing, it is required to use uncoated clear glasses to fill up a cabinet. SIST EN 1096-2:2012

EN 1096-2:2012 (E) 11 Dimensions in millimetres

Key 1. position of the thermocouple 2. substrate holder 3. 6 mm clear glass used for temperature control inside cabinet Figure 2 — Description of the reference thermocouple position 9 Final evaluation of test pieces 9.1 General Test pieces having completed the specified length of time under the test conditions, for the appropriate class, shall be cleaned and if necessary have their surfaces polished before undergoing final evaluation. Dependent on the class, evaluation shall consist of visual inspection and measurement of spectrophotometric properties. 9.2 Cleaning All test pieces shall be cleaned with demineralised water and with a soft tissue. Drying shall also be done with a soft tissue. If necessary this cleaning procedure can be repeated. The non-coated surface of the glass might have been damaged during the tests. If this deterioration would affect the evaluation of the degradation of the coated surface it is permissible to polish the non coated surface. SIST EN 1096-2:2012

EN 1096-2:2012 (E) 12 The polishing can be undertaken using fine abrasive powder e.g. cerium oxide and/or alumina. Care shall be taken to ensure that the polishing compound does not contaminate the coated surface. Coated glasses with coatings on both surfaces shall not be polished. 9.3 Visual Inspection The test pieces to be examined shall be subjected to a visual inspection under an artificial sky according to EN 1096-1. The examination shall be in both transmission and reflection. Inspection of the test samples shall be from a distance of 600 mm. A band 15 mm wide around the edge of the test pieces shall be excluded from the inspection. All defects shall be noted. The requirements for the acceptance of the coated glass related to the different classes are given in Table 1. 9.4 Spectrophotometric measurements 9.4.1 Coated annealed glass The four test pieces which have been subjected to each chemical durability test (condensation resistance test, acid resistance test, neutral salt spray test) shall be cut so that measurement samples are obtained for the spectrophotometric measurements. The actual size of the measurement sample shall be dependent on the equipment being used for the measurement. The measurement samples shall be cut from the centre of the test piece. The test piece which has been subjected to the abrasion resistance test shall be cut so that measurement samples can be obtained for spectrophotometric measurement. The actual size of the measurement samples shall be dependent on the equipment being used for the measurement. The pattern of the cutting of measurement samples is shown in Figure E.2. The transmittance of the measurement sample shall be determined with radiation of normal incidence of the following wavelengths:  550 nm (representative wavelength for light and solar transmittance)  900 nm (representative wavelength for solar transmittance) For glasses claiming to have a low emissivity coating a measurement of the reflectance shall be made at 8 µm with radiation of nearly normal incidence. The requirements for the acceptance of the coated glass related to the different classes are given in Table 1.

9.4.2 Thermally treated coated glass For the thermally treated coated glass, defined in EN 1096-1:2012, 3.1.8 to 3.1.11, as the measurement samples cannot be cut from the test pieces a special procedure has to be employed to make the measurements (see Annex A). SIST EN 1096-2:2012

EN 1096-2:2012 (E) 13

10 Test report The test report shall state the following information: a) general: 1) reference to this European Standard; 2) identification of the manufacturer; 3) identification of the coating (class and commercial name); 4) type of coated glass; 5) for toughened or heat-strengthened coated glass the method of spectrophotometric measurement; b) for each test: 1) number of samples tested; 2) test date; 3) results of the initial inspection; 4) results of the final inspection; 5) test results; 6) comments (if any); c) additional information relating to specific tests: 1) condensation test requiring  total area of pieces tested at the same time;  daily temperature (reference thermocouple and room);  weekly pH;  observation of water condensation on the reference glass piece (every working day); 2) acid test requiring  total area of pieces tested at the same time;  daily temperature in the high temperature phase of the test (reference thermocouple and room);  pH at the end of the cycle;  interruption time between cycles; 3) neutral salt spray requiring SIST EN 1096-2:2012

EN 1096-2:2012 (E) 14  total area of pieces tested at the same time;  daily temperature (reference thermocouple and room); 4) abrasion test requiring  uniformity of abraded area;  number of strokes and frequency of strokes and rotation. NOTE An example of summary of test report is given in Annex G. SIST EN 1096-2:2012

EN 1096-2:2012 (E) 15 Annex A (normative)

Special procedures for thermally treated coated glass A.1 General This annex applies to the following coated glass types:  to be toughened;  toughenable;  to be heat strengthened;  heat strengthenable. A.2 Samples and test pieces for chemical and abrasion tests A sample of the coated glass representative of the production shall be taken. The test pieces are cut from the sample and shall then be toughened or heat strengthened under the same conditions. The following test pieces are required:  chemical tests: 18 test pieces: 100 mm wide x the shortest length, not less than 150 mm, which can be manufactured;  abrasion test: one test piece 300 mm x 300 mm or the nearest size to those which can be manufactured. A.3 Spectrophotometric measurements A.3.1 Samples and test pieces for spectrophotometric measurements For the measurement of the emissivity according to EN 12898, and the radiation properties according to EN 410, small test specimens, not larger than 80 mm x 80 mm, are required. The manufacture of such small samples of thermally treated coated glass is not always possible on a normal production machine. For thermally toughened glass with a coating, the glass cannot be cut after toughening because it fragments into small particles. However, the tempering process influences the properties of the coating, which develops its final properties only after the tempering process. NOTE Heat strengthened glass can be measured via island fragments (see A.3.2.3).

...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklo v gradbeništvu - Steklo z nanosi - 2. del: Zahteve in preskusne metode za nanose razredov A, B in SGlas im Bauwesen - Beschichtetes Glas - Teil 2: Anforderungen an und Prüfverfahren für Beschichtungen der Klassen A, B und SVerre dans la construction - Verre à couche - Partie 2: Exigences et méthodes d'essai pour les couches de classes A, B et SGlass in building - Coated glass - Part 2: Requirements and test methods for class A, B and S coatings81.040.20Steklo v gradbeništvuGlass in buildingICS:Ta slovenski standard je istoveten z:FprEN 1096-2kSIST FprEN 1096-2:2011en,fr,de01-september-2011kSIST FprEN 1096-2:2011SLOVENSKI

STANDARD
kSIST FprEN 1096-2:2011
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
FINAL DRAFT
FprEN 1096-2
June 2011 ICS 81.040.20 Will supersede EN 1096-2:2001English Version

Glass in building - Coated glass -Part 2: Requirements and test methods for class A, B and S coatings

Verre dans la construction - Verre à couche - Partie 2: Exigences et méthodes d'essai pour les couches de classes A, B et S

Glas im Bauwesen - Beschichtetes Glas - Teil 2: Anforderungen an und Prüfverfahren für Beschichtungen der Klassen A, B und S This draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee CEN/TC 129.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. FprEN 1096-2:2011: EkSIST FprEN 1096-2:2011

FprEN 1096-2:2011 (E) 2 Contents Page Foreword ..............................................................................................................................................................41 Scope ......................................................................................................................................................52 Normative references ............................................................................................................................53 Terms and definitions ...........................................................................................................................54 Requirements .........................................................................................................................................65 Samples and test pieces .......................................................................................................................75.1 Preparation .............................................................................................................................................75.1.1 Coated annealed glass ..........................................................................................................................75.1.2 Thermally treated coated glass ............................................................................................................75.1.3 Coated toughened or heat strengthened glass ..................................................................................85.2 Storage ....................................................................................................................................................85.3 Marking ...................................................................................................................................................86 Initial evaluation of test pieces .............................................................................................................86.1 Preparation .............................................................................................................................................86.2 Visual inspection ...................................................................................................................................86.3 Spectrophotometric measurements ....................................................................................................86.3.1 Coated annealed glass ..........................................................................................................................86.3.2 Toughened or heat strengthened coated glass ..................................................................................97 Duration of the tests ..............................................................................................................................98 Test methods ..........................................................................................................................................98.1 General ....................................................................................................................................................98.2 Positioning of test pieces in the test cabinets ................................................................................ 109 Final evaluation of test pieces ........................................................................................................... 119.1 General ................................................................................................................................................. 119.2 Cleaning ............................................................................................................................................... 119.3 Visual Inspection ................................................................................................................................ 129.4 Spectrophotometric measurements ................................................................................................. 129.4.1 Coated annealed glass ....................................................................................................................... 129.4.2 Thermally treated coated glass ......................................................................................................... 1210 Test report ........................................................................................................................................... 12Annex A (normative)

Special procedures for thermally treated coated glass ........................................... 14A.1 General ................................................................................................................................................. 14A.2 Samples and test pieces .................................................................................................................... 14A.3 Spectrophotometric measurements ................................................................................................. 14A.3.1 Introduction ......................................................................................................................................... 14A.3.2 Procedures .......................................................................................................................................... 14Annex B (normative)

Condensation resistance test ..................................................................................... 16B.1 General ................................................................................................................................................. 16B.2 Procedure ............................................................................................................................................ 16B.3 Test cabinet ......................................................................................................................................... 16Annex C (normative)

Acid resistance test ..................................................................................................... 18C.1 General ................................................................................................................................................. 18C.2 Procedure ............................................................................................................................................ 18C.3 Test cabinet ......................................................................................................................................... 18Annex D (normative)

Neutral salt spray test ................................................................................................. 20kSIST FprEN 1096-2:2011

FprEN 1096-2:2011 (E) 3 D.1 General ................................................................................................................................................. 20D.2 Apparatus ............................................................................................................................................. 20D.2.1 Spray cabinet ....................................................................................................................................... 20D.2.2 Heater and temperature control ......................................................................................................... 20D.2.3 Spraying device ................................................................................................................................... 20Annex E (normative)

Abrasion resistance test .............................................................................................. 21E.1 General ................................................................................................................................................. 21E.2 Apparatus ............................................................................................................................................. 21E.2.1 Metal finger .......................................................................................................................................... 21E.2.2 Abrasive felt ......................................................................................................................................... 21E.2.3 Test piece ............................................................................................................................................. 22E.3 Test procedure ..................................................................................................................................... 22Annex F (normative)

Criteria to demonstrate equivalence of coatings ...................................................... 24F.1 Preliminary ........................................................................................................................................... 24F.2 Composition of coatings .................................................................................................................... 24F.3 Previous test reports ........................................................................................................................... 24F.4 Evaluation............................................................................................................................................. 24F.5 Examples .............................................................................................................................................. 24Annex G (informative)

Summary of test report .............................................................................................. 26Bibliography ...................................................................................................................................................... 28 kSIST FprEN 1096-2:2011

FprEN 1096-2:2011 (E) 4 Foreword This document (FprEN 1096-2:2011) has been prepared by Technical Committee CEN/TC 129 “Glass in building”, the secretariat of which is held by NBN. This document is currently submitted to the Unique Acceptance Procedure. This document will supersede EN 1096-2:2001. The main changes compared to the previous edition are:

 reference to the future EN 1096-5, Test method and classification for the Self-cleaning performances of coated glass surfaces;

 the introduction of a method to deal with toughenable / heat strengthenable and to be toughened / to be heat strengthened coated glass, see Annex A.

kSIST FprEN 1096-2:2011

FprEN 1096-2:2011 (E) 5 1 Scope This European Standard specifies requirements and test methods related to artificial weathering and abrasion of coatings on glass for use in buildings. These tests are aimed at evaluating the resistance of the coating to attack by simulated natural weathering conditions as well as to abrasion. This attack can be considered as representative of that which could be found on the external and/or internal face of the glazing. This European Standard applies to Class A, B and S coatings, as described in EN 1096-1. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 410, Glass in Building — Determination of luminous and solar characteristics of glazing EN 1096-1, Glass in building — Coated glass — Part 1: Definitions and classification. EN 12898, Glass in building — Determination of emissivity 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. For the purposes of these definitions, the term thermally toughened also applies to heat soaked thermally toughened. 3.1 coated annealed glass coated glass which has an annealed glass substrate 3.2 coated toughened or heat strengthened glass coated glass which has a thermally toughened or heat strengthened glass substrate 3.3 thermally treated coated glass coated glass that is thermally toughened or heat strengthened 3.3.1 coated glass - to be toughened or to be heat strengthened coated glass which has to be thermally toughened or heat strengthened to meet its final spectrophotometric properties

3.3.2 toughenable or heat strengthenable coated glass coated glass which can be thermally toughened or heat strengthened while keeping its final spectrophotometric properties

kSIST FprEN 1096-2:2011

FprEN 1096-2:2011 (E) 6 4 Requirements The coated glass complying with this European Standard shall respect the requirements related to the different characteristics given in Table 1.

Table 1 — Requirements Characteristics Test Method Requirements Visual Inspection Spectrophotometric measurements Condensation resistance Annex B - No defect, as defined in EN 1096-1, greater than 3 mm length - Maximum one defect between 2 mm and 3 mm length - Maximum five defects between 1 mm and 2 mm length In addition, no scratches, staining of the coating or clusters of pinholes greater than 1 mm shall be allowed (see EN 1096-1). When compared with the reference test piece, in both reflection and transmission, there shall be no significant colour change. This observation shall be made within 20 sa

. The transmittance measured at 550 nm and 900 nm shall differ by no more than ± 0,03 from the corresponding measured value on the reference test piece.

For a glass claimed to have a low emissivity coating the reflectance at 8 µm shall decrease by no more than 0,02. Acid resistance Annex C No requirements Neutral salt spray resistance Annex D - No defect, as defined in EN 1096-1, greater than 3 mm length - Maximum one defect between 2 mm and 3 mm length - Maximum five defects between 1 mm and 2 mm length In addition, no scratches, staining of the coating or clusters of pinholes greater than 1 mm shall be allowed (see EN 1096-1). When compared with the reference test piece, in both reflection and transmission, there shall be no significant colour change. This observation shall be made within 20 sa

. Abrasion resistance Annex E No requirement other than to ensure that the abraded area is uniform Total (diffuse plus direct) transmittance measured at 550 nm and 900 nm shall differ by no more than ± 0,05 from the corresponding value measured for the reference test piece. a The time for observation is fixed to 20 s in order to have a reference period which can influence the visual inspection.

kSIST FprEN 1096-2:2011
FprEN 1096-2:2011 (E) 7 5 Samples and test pieces

5.1 Preparation 5.1.1 Coated annealed glass A sample of 300 mm x 300 mm is needed for each test. For the three chemical durability tests, the test pieces are obtained by cutting the sample as shown in Figure 1. The abrasion test is undertaken on a

300 mm x 300 mm test piece. It is recommended that a spare sample be supplied in the event of one sample not being defect free.

Key 1. test pieces 2. reference test piece for visual inspection 3. reference test piece for spectrophotometric measurement Figure 1 — Plan for cutting a sample into test pieces 5.1.2 Thermally treated coated glass For the thermally treated coated glass, defined in 3.3, as the test pieces cannot be cut from test samples, a special procedure has to be employed to obtain the test pieces (see Annex A). kSIST FprEN 1096-2:2011

FprEN 1096-2:2011 (E) 8 5.1.3 Coated toughened or heat strengthened glass Use coated annealed glass samples for testing this type of coated glass. 5.2 Storage The test pieces shall be stored inside a room at a temperature of (23 ± 5) °C with a relative humidity less than 80 %. Storage shall prevent dust, chemicals or condensation reacting with the test pieces. The test pieces shall not be stored for more than three months before performing the test.

5.3 Marking The test pieces shall be marked on the uncoated glass surface. The following information shall be marked:  manufacturers' coating reference  test pieces number 1 to 4  code for test Glasses with coating on both surfaces shall be marked without damaging the coating. The two reference test pieces shall be marked as the test pieces plus "ref". 6 Initial evaluation of test pieces

6.1 Preparation All test pieces shall be cleaned with demineralised water and with a soft tissue. Drying shall also be done with a soft tissue. If necessary this cleaning procedure can be repeated. 6.2 Visual inspection The test pieces shall be subjected to a visual inspection under an artificial sky in accordance with EN 1096-1. The inspection shall take place in both transmission and reflection. The test pieces shall be observed at a distance of 600 mm. All test pieces shall be defect free. No scratches or pinholes shall be observed. If a test piece contains defects it shall be replaced. NOTE The replacement of test pieces is to avoid any misinterpretation of the testing results. 6.3 Spectrophotometric measurements 6.3.1 Coated annealed glass A measurement sample shall be cut from the centre of the reference test piece. The actual size shall be dependent on the type of equipment being used for the measurements. The transmittance of the measurement sample shall be measured with radiation of normal incidence at the following wavelengths:  550 nm (representative wavelength for light and solar transmittance);  900 nm (representative wavelength for solar transmittance). For glass claiming to have a low emissivity coating a measurement of the reflectance shall be made at 8 µm using radiation of nearly normal incidence. kSIST FprEN 1096-2:2011

FprEN 1096-2:2011 (E) 9 6.3.2 Toughened or heat strengthened coated glass As the measurement sample cannot be cut from the reference test piece, a special procedure has to be employed to make the measurement (see Annex A). 7 Duration of the tests The durations of the tests are set out in Table 2. Table 2 — Duration of the tests Test Test duration for class A B S Condensation resistance Acid resistance Neutral salt spray Abrasion resistance 21 days 5 cycles 21 days 500 strokes 4 days 1 cycle 10 days 50 strokes 14 days 5 cycles a

500 strokes a The neutral salt spray test is excluded for Class S coatings as they are subject to frequent cleaning in the applications for which they are used in accordance with EN 1096-1.

8 Test methods 8.1 General The coated glass complying to this part of the European Standard shall pass the tests given in Annexes B, C, D and E which are designed to verify the chemical and mechanical characteristics of the coating. The tests are as follows:  condensation resistance test (see Annex B)  acid resistance test (see Annex C)  neutral salt spray test (see Annex D)  abrasion resistance test (see Annex E) These tests are evaluated by their effect on the visual quality of the product and its spectrophotometric properties. Whilst it would be feasible to evaluate the spectrophotometric properties across the entire spectrum, a number of representative wavelengths have been selected. These wavelengths represent transmission of light and energy, together with reflectance relating to emissivity, where appropriate. kSIST FprEN 1096-2:2011

FprEN 1096-2:2011 (E) 10 Each test shall be carried out without interruption. The only exception is the acid resistance test which can be interrupted after each cycle. However, any interruption shall not exceed three days. Testing shall start as soon as possible after the test pieces have been cleaned. The exception is the abrasion resistance test where testing shall commence within 30 min of the test piece being cleaned. Care shall be taken to ensure the test pieces are clean and uncontaminated.

8.2 Positioning of test pieces in the test cabinets The test pieces shall have their coated side oriented upwards, the pieces presenting an angle of (15 ± 5)° with the vertical, and the coated side shall face away from the door. For consistent results, a certain quantity of glass shall be present. For 300 l cabinet the total weight of the glasses shall be (7,5 ± 0,5) kg. An insufficient quantity of coated glass shall be compensated with uncoated clear glasses. In the centre of the test pieces a piece of 6 mm clear glass is placed, with the reference thermocouple attached (see Figure 2). The following spacing shall be maintained:  distance from the walls not less than 100 mm  distance between bottom of the test pieces and water not less than 200 mm  spacing between adjoining test pieces not less than 20 mm

not more than 40 mm Where there is an insufficient quantity of coated glass for testing, it is required to use uncoated clear glasses to fill up a cabinet. kSIST FprEN 1096-2:2011

FprEN 1096-2:2011 (E) 11 Dimensions in millimetres

Key 1. position of the thermocouple 2. substrate holder 3. 6 mm clear glass used for temperature control inside cabinet Figure 2 — Description of the reference thermocouple position 9 Final evaluation of test pieces 9.1 General Test pieces having completed the specified length of time under the test conditions, for the appropriate class, shall be cleaned and if necessary have their surfaces polished before undergoing final evaluation. Dependent on the class, evaluation shall consist of visual inspection and measurement of spectrophotometric properties. 9.2 Cleaning All test pieces shall be cleaned with demineralised water and with a soft tissue. Drying shall also be done with a soft tissue. If necessary this cleaning procedure can be repeated. The non-coated surface of the glass might have been damaged during the tests. If this deterioration would affect the evaluation of the degradation of the coated surface it is permissible to polish the non coated surface. kSIST FprEN 1096-2:2011

FprEN 1096-2:2011 (E) 12 The polishing can be undertaken using fine abrasive powder e.g. cerium oxide and/or alumina. Care shall be taken to ensure that the polishing compound does not contaminate the coated surface. Coated glasses with coatings on both surfaces shall not be polished. 9.3 Visual Inspection The test pieces to be examined shall be subjected to a visual inspection under an artificial sky according to EN 1096-1. The examination shall be in both transmission and reflection. Inspection of the test samples shall be from a distance of 600 mm. A band 15 mm wide around the edge of the test pieces shall be excluded from the inspection. All defects shall be noted. The requirements for the acceptance of the coated glass related to the different classes are given in Table 1. 9.4 Spectrophotometric measurements 9.4.1 Coated annealed glass The four test pieces which have been subjected to each chemical durability test (condensation resistance test, acid resistance test, neutral salt spray test) shall be cut so that measurement samples are obtained for the spectrophotometric measurements. The actual size of the measurement sample shall be dependent on the equipment being used for the measurement. The measurement samples shall be cut from the centre of the test piece. The test piece which has been subjected to the abrasion resistance test shall be cut so that measurement samples can be obtained for spectrophotometric measurement. The actual size of the measurement samples shall be dependent on the equipment being used for the measurement. The pattern of the cutting of measurement samples is shown in Figure E.2. The transmittance of the measurement sample shall be determined with radiation of normal incidence of the following wavelengths:  550 nm (representative wavelength for light and solar transmittance)  900 nm (representative wavelength for solar transmittance) For glasses claiming to have a low emissivity coating a measurement of the reflectance shall be made at 8 µm with radiation of nearly normal incidence. The requirements for the acceptance of the coated glass related to the different classes are given in Table 1.

9.4.2 Thermally treated coated glass For the thermally treated coated glass, defined in 3.3, as the measurement samples cannot be cut from the test pieces a special procedure has to be employed to make the measurements (see Annex A). 10 Test report The test report shall state the following information: a) general: 1) reference to this European Standard; kSIST FprEN 1096-2:2011

FprEN 1096-2:2011 (E) 13 2) identification of the manufacturer; 3) identification of the coating (class and commercial name); 4) type of coated glass; 5) for toughened or heat-strengthened coated glass the method of spectrophotometric measurement; b) for each test: 1) number of samples tested; 2) test date; 3) results of the initial inspection; 4) results of the final inspection; 5) test results; 6) comments (if any); c) additional information relating to specific tests: 1) condensation test requiring  total area of pieces tested at the same time;  daily temperature (reference thermocouple and room);  weekly pH;  observation of water condensation on the reference glass piece (every working day); 2) acid test requiring  total area of pieces tested at the same time;  daily temperature in the high temperature phase of the test (reference thermocouple and room);  pH at the end of the cycle;  interruption time between cycles; 3) neutral salt spray requiring  total area of pieces tested at the same time;  daily temperature (reference thermocouple and room); 4) abrasion test requiring  uniformity of abraded area;  number of strokes and frequency of strokes and rotation. NOTE An example of summary of test report is given in Annex G. kSIST FprEN 1096-2:2011

FprEN 1096-2:2011 (E) 14 Annex A (normative)

Special procedures for thermally treated coated glass A.1 General This annex applies to the following coated glass types:  to be toughened;  toughenable;  to be heat strengthened;  heat strengthenable. A.2 Samples and test pieces A sample of the coated glass representative of the production shall be taken. The test pieces are cut from the sample and shall then be toughened or heat strengthened under the same conditions. The following test pieces are required:  chemical tests: 18 test pieces: 100 mm wide x the shortest length, not less than 150 mm, which can be manufactured;  abrasion test: one test piece 300 mm x 300 mm or the nearest size to those which can be manufactured. A.3 Spectrophotometric measurements A.3.1 Introduction For the measurement of the emissivity according to EN 12898, and the radiation properties according to EN 410, small test specimens, not larger than 80 x 80 mm, are required. The manufacture of such small samples of thermally treated coated glass is not always possible on a normal production machine. For thermally toughened glass with a coating, the glass cannot be cut after toughening because it fragments into small particles. However, the tempering process influences the properties of the coating, which develops its final pr

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