oSIST prEN 1096-5:2011

Glass in building - Coated glass - Part 5: Test method and classification for the self-cleaning performances of coated glass surfaces

This draft defines a test method to establish the self-cleaning performances and classes for coatings on glass
which utilise sun, rain or a combination of sun and rain to enhance the cleanliness of the glass.
The draft applies to coated glass for use in outdoor building applications. The test is designed to be applicable
for coatings on glass which use hydrophilic or photocatalytic active functionalities to enhance the cleanliness
of the glass.
The test procedure does not specifically address the durability of the coatings self cleaning functionality.
The test method is designed to be run on monolithic samples of the products. In cases where dual coated
products (that is, a glass presenting self cleaning coating on one side and another coating on the other side)
exist it would be necessary to obtain the equivalent glass with only the self cleaning coating on one side (or to
remove the back side coating by polishing, providing it does not damage the self cleaning coating on the
opposite side). If not possible, adapted protection of back side coating should be added (such as protective
film with electrostatic or low adhesive charge,or DGU assembly)
For tinted glass and absorbing layers (a self cleaning or dual coatings) the luminous absorption might affect
the haze measurements. The test has to be runned on clear glass and extrapolation will be made for tinted
glass and absorbing layers.

Glas im Bauwesen - Beschichtetes Glas - Teil 5: Prüfverfahren und Klasseneinteilung für das Selbstreinigungsverhalten von beschichteten Glasoberflächen

In diesem Entwurf wird ein Prüfverfahren beschrieben, mit dessen Hilfe das Selbstreinigungsverhalten und Klassen für Beschichtungen auf Glas festgelegt werden können, die unter Nutzung von Sonne, Regen oder einer Kombination aus Sonne und Regen die Sauberkeit des Glases verbessern sollen.
Dieser Entwurf gilt für beschichtetes Glas im Außenbereich von Gebäuden. Die Prüfung wurde zur Anwendung für Beschichtungen auf Glas entwickelt, die hydrophile oder photokatalytisch wirksame Funktionen für die Verbesserung der Sauberkeit des Glases nutzen.
Das Prüfverfahren berücksichtigt nicht im Speziellen die Dauerhaftigkeit der Selbstreinigungsfunktion von Beschichtungen.
Das Prüfverfahren wurde für die Durchführung an monolithischen Proben der Produkte entwickelt. Im Falle eines doppelt beschichteten Produkts (d. h. ein Glas, das eine selbstreinigende Beschichtung auf der einen Seite und eine andere Beschichtung auf der anderen Seite aufweist), wäre es erforderlich, das entsprechende Glas mit ausschließlich der selbstreinigenden Beschichtung auf der einen Seite zu beschaffen (oder die Beschichtung auf der Rückseite durch Polieren zu entfernen, vorausgesetzt, dass die selbstreinigende Beschichtung auf der gegenüberliegenden Seite dabei nicht beschädigt wird). Ist das nicht möglich, sollte auf der Beschichtung auf der Rückseite ein zusätzlicher Schutz aufgebracht werden (z. B. ein Schutzfilm mit elektrostatischer oder gering haftender Aufladung oder durch die Montage einer Doppelverglasung).
Bei getöntem Glas und Absorptionsschichten (eine selbstreinigende Beschichtung oder Doppel-beschichtungen) kann sich die Strahlenabsorption auf die Trübungsmessungen auswirken. Die Prüfung muss mit Klarglas durchgeführt werden und bei getöntem Glas und Absorptionsschichten muss eine Extrapolation vorgenommen werden.

Verre dans la construction - Verre à couche - Partie 5: Méthode d'essai et classification des performances autonettoyantes des surfaces de verre à couche

Le présent projet définit une méthode d’essai permettant d’établir les performances autonettoyantes et les classes des couches sur verre utilisant le soleil, la pluie ou une combinaison des deux pour améliorer la propreté du verre.
Le présent projet s’applique au verre à couche utilisé pour des applications à l’extérieur des bâtiments. L’essai est conçu pour être applicable aux couches sur verre qui utilisent des fonctions actives hydrophiles ou photocatalytiques pour améliorer la propreté du verre.
Le mode opératoire d’essai ne traite pas spécifiquement de la durabilité de la fonction autonettoyante des couches.
La méthode d’essai est conçue pour être utilisée sur des échantillons monolithiques des produits. Si le produit est à revêtement dual (c’est-à-dire qu’il s’agit d’un verre présentant une couche autonettoyante sur une face et une autre couche sur l’autre face), il est nécessaire d’obtenir un verre équivalent ayant uniquement une couche autonettoyante sur une face (ou d’éliminer la couche sur l’autre face par polissage, à condition que cela n’endommage pas la couche autonettoyante sur la face opposée). Si cela est impossible, il convient d’ajouter une protection appropriée sur la couche de la face arrière (par exemple un film protecteur avec une charge électrostatique ou faiblement adhésive, ou un montage en double vitrage).
Pour le verre teinté et les couches absorbantes (couche autonettoyante ou revêtement dual), l’absorption lumineuse pourrait avoir une incidence sur le mesurage du flou. L’essai doit être réalisé sur un verre clair et extrapolé pour le verre teinté et les couches absorbantes.

Steklo v gradbeništvu - Steklo z nanosi - 5. del: Metode preskušanja in klasifikacija za samočistilne lastnosti površine stekla z nanosom

General Information

• Status: Not Published
• Public Enquiry End Date: 29-Sep-2011
• ICS: 81.040.20 - Glass in building
• Technical Committee: STV - Steklo, svetloba in razsvetljava v gradbeništvu
• Current Stage: 98 - Abandoned project (Adopted Project)
• Start Date: 16-Sep-2013
• Due Date: 21-Sep-2013
• Completion Date: 16-Sep-2013
• Directive: 89/106/EEC - Construction products
• Mandate: M/135 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on flat glass, profiled glass and glass block products
• Ref Project: prEN 1096-5 - Glass in building - Coated glass - Part 5: Test method and classification for the self-cleaning performances of coated glass surfaces

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 1096-5:2011
01-september-2011
6WHNORYJUDGEHQLãWYX6WHNOR]QDQRVLGHO0HWRGHSUHVNXãDQMDLQNODVLILNDFLMD
]DVDPRþLVWLOQHODVWQRVWLSRYUãLQHVWHNOD]QDQRVRP
Glass in building - Coated glass - Part 5: Test method and classification for the self-
cleaning performances of coated glass surfaces
Glas im Bauwesen - Beschichtetes Glas - Teil 5: Prüfverfahren und Klasseneinteilung für
das Selbstreinigungsverhalten von beschichteten Glasoberflächen
Verre dans la construction - Verre à couche - Partie 5: Méthode d'essai et classification
des performances autonettoyantes des surfaces de verre à couche
Ta slovenski standard je istoveten z: prEN 1096-5
ICS:
81.040.20 Steklo v gradbeništvu Glass in building
oSIST prEN 1096-5:2011 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 1096-5:2011

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oSIST prEN 1096-5:2011


EUROPEAN STANDARD
DRAFT
prEN 1096-5
NORME EUROPÉENNE

EUROPÄISCHE NORM

May 2011
ICS 81.040.20
English Version
Glass in building - Coated glass - Part 5: Test method and
classification for the self-cleaning performances of coated glass
surfaces
Verre dans la construction - Verre à couche - Partie 5: Glas im Bauwesen - Beschichtetes Glas - Teil 5:
Méthode d'essai et classification des performances Prüfverfahren und Klasseneinteilung für das
autonettoyantes des surfaces de verre à couche Selbstreinigungsverhalten von beschichteten
Glasoberflächen
This draft European Standard is submitted to CEN members for enquiry. 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 Ref. No. prEN 1096-5:2011: E
worldwide for CEN national Members.

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Contents Page
Foreword .4
1 Scope .4
2 Normative references .4
3 Terms and definitions .4
4 Principle of the test.5
5 Instrumentation .6
5.1 UVA-Illumination chamber .6
5.2 Sample support .6
5.3 Spraying nozzle .6
5.4 Dirt mixture pressure tank .6
5.5 Water pressure tank .7
5.6 Timer for spray .7
6 Preparation of the glass samples .7
6.1 Tested sample .7
6.2 Reference .8
7 Principle of haze measurement .8
7.1 Back side cleaning.8
7.2 Position of haze measurements on the samples .8
7.3 Measurement of Transmission Haze .9
8 Preparation of dirt mixture . 10
8.1 Stearic acid solution . 10
8.2 Adipic acid solution . 10
8.3 Solid compound suspension . 10
8.4 Final dirt mixture . 11
9 Test procedure . 11
9.1 Initial activation . 11
9.1.1 Glass samples cleaning . 11
9.1.2 UV irradiation . 11
9.1.3 Initial haze measurement . 12
9.2 First cycle . 12
9.2.1 Dirt mixture spraying . 12
9.2.2 Drying . 12
9.2.3 Haze measurement after dirt spray . 13
9.2.4 UV-A irradiation . 13
9.2.5 Haze measurement after UV illumination . 13
9.2.6 Deionised water spraying . 13
9.2.7 Drying . 14
9.2.8 Haze measurement . 14
9.3 Second cycle . 14
9.4 Collection of the results . 14
10 Classification . 15
11 Test report . 15
Annex A (normative) Sample support and spray installation . 17
A.1 Spray rig . 17
A.2 Spray system . 18
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Annex B (normative) Haze measurement method . 20
B.1 The instrument . 20
B.2 Calculation . 21
B.3 Values . 22
B.4 Short cut procedures . 22
Annex C (normative) Contamination checking procedure . 23
Annex D (normative) Statistical analysis of test results . 24
D.1 Calculation of statistical numbers to obtain a self cleaning functionality used for
classification of coated glass . 24
Annex E (informative) Round Robin tests . 26

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Foreword
This document (prEN 1096-5:2011) 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 CEN Enquiry.
1 Scope
This draft defines a test method to establish the self-cleaning performances and classes for coatings on glass
which utilise sun, rain or a combination of sun and rain to enhance the cleanliness of the glass.
The draft applies to coated glass for use in outdoor building applications. The test is designed to be applicable
for coatings on glass which use hydrophilic or photocatalytic active functionalities to enhance the cleanliness
of the glass.
The test procedure does not specifically address the durability of the coatings self cleaning functionality.
The test method is designed to be run on monolithic samples of the products. In cases where dual coated
products (that is, a glass presenting self cleaning coating on one side and another coating on the other side)
exist it would be necessary to obtain the equivalent glass with only the self cleaning coating on one side (or to
remove the back side coating by polishing, providing it does not damage the self cleaning coating on the
opposite side). If not possible, adapted protection of back side coating should be added (such as protective
film with electrostatic or low adhesive charge,or DGU assembly)
For tinted glass and absorbing layers (a self cleaning or dual coatings) the luminous absorption might affect
the haze measurements. The test has to be runned on clear glass and extrapolation will be made for tinted
glass and absorbing layers.
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.
EN1096-1:1998, Glass in Building – Coated Glass – Part 1: Definitions and classifications
EN1096-2:2001, Glass in Building – Coated Glass – Part 2: Requirements and test methods for class A, B
and S coatings
ISO 4892-1:2000, Plastics – Methods of exposure to laboratory light sources – Part 1: General guideline.
ISO 4892-3:2006, Plastics – Methods of exposure to laboratory light sources – Part 3: Fluorescent UV lamps.
3 Terms and definitions
For the purposes of this document, the following definitions apply, and when not conflicting, the definitions of
EN 1096-1 apply.
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3.1
coated glass
glass substrate as defined in 3.2 to which has been applied a coating, as defined in 3.3 in order to modify one
or more of its properties
3.2
glass substrate
a basic glass, thermally toughened safety glass, heat-strengthened glass
3.3
coating
one or more thin solid layers of inorganic materials applied onto the surface of a glass substrate by various
methods of deposition as described in EN 1096-1
3.4
dual coating
glass substrates as defined in 3.2 to which have been applied coatings as defined in 3.3 on both sides
3.5
self cleaning coating
coating or surface treatment of glass substrates allowing obtaining or maintaining a cleaner surface as
compared to untreated glass in time
3.6
hydrophilic coating
coating allowing maintaining a water contact angle of less than 20 °
3.7
photocatalytic coating
coating containing a substance that performs one or more functions based on oxidation and reduction
reactions under photoirradiation, inducing decomposition and removal of contaminants
3.8
secondary coating
coating deposited on the opposite side of a self cleaning coating, in case of dual coatings
3.9
definition of haze
incident light on glass samples with dirt deposit is diffused scattered and the effect in transmission is seen as
reduction of contrast of objects observed through the glass. Haze is the percentages of the total transmitted
lights which in passing through the glass deviate from the incident beam more than 2.5 degree. Haze is wide
angle scattering of light.
4 Principle of the test
The principle of the test consists in applying a model dirt on the glass with a spray, then simulate natural
weather action by applying UV irradiation (to simulate sun) then water spray (to simulate rain). This cycle is
repeated twice to ensure better stability of results. The criterion would be the degree of sample cleanliness
after the second cycle.
The cleanliness perception is evaluated by measurement of the haze of the sample, more especially the
difference of haze between initial and final stage of the test:
∆H = H −H
final initial
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Thus measurements of initial haze (after cleaning) and final haze (at the end of the second cycle) are the only
compulsory measurements. However, it is strongly recommended to measure haze at each step of the test
(as explained in paragraph 9) in order to check that there is no deviation of the test.
General observation: the test and all handling of the product to be tested shall be performed in a clean
environment, that is, exempt from any source of contamination (organics, silicones, dust) which could modify
the surface, affect the functionality, the test conditions or the haze measurements (an example of
contamination test is given in Annex C).
5 Instrumentation
5.1 UVA-Illumination chamber
The UV illumination should be performed in a clean environment. A closed chamber is recommended. The
chamber shall be equipped with UVA-340 lamps, such as described in table 1 in standard EN ISO 4892-
3:2006 (“type I” lamps).
The irradiation power is set to 0.68 W/m²/nm at 340 nm on the surface of the samples, which is the maximal
irradiance of solar light according to CIE 85 table 4. The irradiation level has to be maintained constant and
has to be uniformly distributed such as to ensure a same level of irradiation on all the samples (check
tolerances in EN ISO 4892-3). The irradiation level can be monitored with a radiometer. The intensity of the
lamp can be controlled continuously and adjusted to balance aging of the lamps.
Relative Humidity shall be maintained between 15 and 30% inside the chamber during the irradiation period.
The air temperature in the chamber is set to the minimum: the UVA cabinet shall be placed in a well-ventilated
area, where the temperature doesn’t exceed 27 °C, and its vents shall be fully opened, to ensure that the
temperature inside the cabinet remains between 25 °C and 35°C. The temperature and RH should be
monitored and given in the test report.
NOTE Standardized equipment UV2000 or UVCon from Atlas or QUV from Q panel have been used during the
Round Robin tests.
The cabinet shall be clean and exempt of any contamination source, especially silicone source.
5.2 Sample support
For the spraying steps, the sample shall be installed on a support, with an inclination of 10° from vertical. The
full description of support is shown in Annex A.
5.3 Spraying nozzle
The spraying nozzle is fixed horizontally and aligned with the centre of the haze measurement area on the
glass samples. The distance between the nozzle tip and the glass sample is 300 mm, as described in Annex
A. The nozzle used shall be a full cone airless nozzle with a large spray angle (120°).
NOTE Nozzle SSD-VKL-1-120°-1.4571, from Spraying Systems Germany has been used during the Round Robin
tests.
5.4 Dirt mixture pressure tank
The dirt mixture shall be placed in a dedicated pressure vessel equipped with a mechanical or magnetic stirrer.
Pressure vessel shall be made of inert material and should not contain any silicone contamination source.
NOTE 1 Commercial equipment 83S-211-AT SS pressure tank with direct rotary agitation from ITW-Binks has been
used for Round Robin tests.
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NOTE 2 Attention shall be paid to ensure sufficient height of liquid in the container in order to avoid air bubbles in the
pulverisation system, which can strongly affect final results. The section of container can be lowered by using a narrower
container inside the pressure tank to reduce necessary solution volumes
5.5 Water pressure tank
The water pressure tank can be a simple clean pressurized tank. Same precautions against air bubbles
should be taken as described in 5.4.
5.6 Timer for spray
It is recommended to use an automatic timer (such as a solenoid valve) to obtain better precision on
pulverisation time, thus on sprayed volumes.
6 Preparation of the glass samples
6.1 Tested sample
The minimum number of samples to be tested for a given product is at least 6 samples. The chosen number
of samples will be indicated as “n”.
Cut n glass samples of 150 mm x150 mm.
In case the product to be tested shall be toughened to become active, the test shall be run on toughened
samples. In this case, one can use a 150 mm x 300 mm sample, but the analysed area will be the central
zone and the sample will be positioned with the larger side horizontally, as described in figure 1.
Engrave the sample references on the upper left corner of the opposite side from the side to be tested i.e. non
coated side.
All dimensions in mm


Key
1 annealed sample, test zone
2 toughened sample
3 test zone on toughened sample
Figure 1 — Description of test samples (annealed and toughened)
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6.2 Reference
The use of a reference is recommended. The reference can be chosen by the laboratory. It shall present a
behaviour known in advance. For instance, a commercial product can be used. The use of clear float glass as
a reference should be avoided, due to the sensibility of its surface to its history. Criteria of choice for the
reference are:
 stability of performances and homogeneity
 availability
 low visible absorption
 low initial haze
Examples of references are:
 silica sheets
 float glass coated with a given oxide layer, resistant to corrosion (such as silica or photocatalytic coating)
 commercially available photocatalytic self cleaning glass
At least 6 samples of reference per batch should be tested.
7 Principle of haze measurement
7.1 Back side cleaning
Before each haze measurement, it should be ensured that the back side contamination cannot affect haze
measurement. The back side shall be cleaned before haze measurement. The back side can be cleaned with
a commercial glass cleaner and clean new soft paper tissue. Avoid touching the measurement side when
cleaning the back side.
7.2 Position of haze measurements on the samples
Haze measurements shall be performed on each sample in 9 positions, identical at each step of the test. To
achieve identical positioning for each haze measurement steps, it is recommended to mark the haze
measurement points with a felt-tip (or diamond pen) on the opposite side from the tested side of the samples,
as described in figure 2.
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All dimensions are in mm

Key
1 sample
2 positioning dots
3 haze meter port
Figure 2 — Haze measurement - location of the 9 positioning dots and location of the haze meter port
above the positioning dots
7.3 Measurement of Transmission Haze
Measure the total luminous transmission, T , and the wide-angle scattered transmission, T , each of the nine
t, d
points marked by means of the model (figure 2), according to the procedure described in Annex B. The
reference of the sample should always be on the top right corner viewed from the coating side. The haze
measurements will be made just above the marked point, with the surface to be tested facing opposite to the
measurement port to avoid contact of the side to be tested with the measurement equipment.
The haze value, H, is expressed as the ratio of scattered transmission to total luminous transmission, in
percent:
T
d
H = 100
T
t
ij
The value of haze for each measurement point shall be registered as "H ”.
where:
i is the number of haze measurement point as described in figure 2 (i = 1 to 9)

j is the number of the sample (j = 1 to n).
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8 Preparation of dirt mixture
8.1 Stearic acid solution
In a wide-necked bottle with a plastic cork equipped with a magnetic stirrer,
 put 500 ml of absolute ethanol
 dissolve 2.5 of stearic acid (CAS N° 57-11-4, purity > 90%) in the ethanol
 stir the solution until complete dissolution of the acid, which may take 10 to 45 min at standard laboratory
temperature (i.e. temperature between 20 and 23°C).
8.2 Adipic acid solution
In a wide-necked bottle with a plastic cork equipped with a magnetic stirrer:
 put 10 g of 99,6 % pure adipic acid
 add 200 ml propan-2-ol
 then add 200 ml deionised water
 stir the solution until complete dissolution of the adipic acid, which may take 15 to 20 min and may require
heating via a water bath.
8.3 Solid compound suspension
Put into a 3l wide-necked bottle with a plastic cork the following amounts of products:
 Soluble components:
0.15 g copper nitrate trihydrate (Cu(NO ) , 3H O, CAS N°- 10031-43-3, purity=99%)
3 2 2
0.15 g zinc nitrate hexahydrate ( N O Zn, 6H O , CAS- N°10196-18-6,-purity=99%)
2 6 2
0.80 g calcium nitrate tetrahydrate (CaN O , 4H O , CAS N°-13477-34-4, purity=98%)
2 6 2
0.30 g sodium chloride (CAS N°-7647-14-5, purity= 99%)
0.40 g potassium sulphate (CAS N°-7778-80-5, purity=99%)
0.30 g sodium sulphate (CAS N°-7757-82-6, purity=99,5%)
 Non soluble components:
0.50 g kaolin (CAS N° 1332-58-7) (d =2,5 µm)
50
0.30 g calcium sulphate dihydrate (CaSO , 2H O , CAS N°-10101-41-4, purity=98%)
4 2
 Add to the solid compounds 50 ml deionised water and stir.
 Then add 50 ml propan-2-ol. Stir vigorously this mixture;
NOTE in case that the solid compound visibly tends to aggregate, a light grounding (to break aggregates) is
recommended.
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8.4 Final dirt mixture
 take solid compound suspension prepared in (8.3)
 add the adipic acid solution prepared in (8.2)
 then add the stearic acid solution prepared in (8.1)
 dilute the mixture by adding 2 l of a (2:1:1) absolute ethanol / propan-2-ol/deionised water mixture
 stir the resulting mixture for a further two hours to get a good homogeneity
For all the masses (organic and inorganic compounds) a tolerance of 1% is accepted.
This suspension can be kept for the full length of the test (2 cycles). The dirt mixture shall be stored in a
closed vessel with continuous agitation to avoid evaporation and segregation of particles. Ensure solution is
maintained in standard laboratory conditions during all the procedure (20°C-23°C). The maximal duration of
the dirt mixture conservation is 120 hours.
A new dirt mixture has to be prepared for a new test run.
9 Test procedure
9.1 Initial activation
9.1.1 Glass samples cleaning
Proceed to careful cleaning of glass surface:
 Wear latex gloves while doing these operations, and from now on wear gloves as soon as the glass
samples are manipulated during the test.
 Rub the two sides of the samples with a piece of cotton wool soaked with a surfactant. The use of an
alcoholic solution is not suitable in this case.
NOTE RBS 25MD diluted in DI water (2% vol.) has been used for the Round Robin tests.
 Rinse the glass samples under deionised water and rub with the hand to eliminate any remaining trace.
 Then rinse again the glass samples under deionised water.
 Dry the samples with nitrogen or filtered clean compressed air.
For the transport of the samples a closed box is recommended from this stage and to all next stages to
prevent surface contamination (for instance by particle). It is essential that when handled, the coated surface
is not touched and as such the glass samples should be held using the edges only.
9.1.2 UV irradiation
Irradiate the glass samples under UVA according to clause 5.1, for (12 to 24) hours to fully activate the
samples, according to supplier specifications.
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9.1.3 Initial haze measurement
Measure the haze of the glass samples according to clause 7. The haze measurement shall be carried out
within 1 hour after illumination.
i,j
The nine haze measurements per sample should be recorded as: H
initial
9.2 First cycle
Pour the “dirt mixture” into the pressure vessel dedicated to the dirt mixture (with mechanical stirrer) The
stirring shall be continuous and vigorous so that the non dissolved kaolin and potassium and sodium sulphate
particles stay in suspension in the solution; otherwise those particles can aggregate and form quickly a
deposit which can affect the solution performances.
9.2.1 Dirt mixture spraying
The dirt mixture spraying shall be carried out in the first hour following the UV irradiation to avoid any pollution
on the samples and deactivation.
1) Stir the dirt mixture vigorously inside the pressure vessel with a magnetic or mechanical stirring
2) Set up pressure of liquid as controlled with pressure gauge at 2 bars above atmospheric pressure (a
tolerance of +/- 10% is accepted)
3) Spray the dirt mixture at a flow rate of 0.6 l/min, (with a tolerance of 5%) for a minimum of 6 s period
with a beaker placed over the nozzle to allow the spray to get up to pressure and to eliminate the air
bubbles of the liquid circuit
4) Control tha
...