SIST EN 927-6:2007
(Main)Paints and varnishes - Coating materials and coating systems for exterior wood - Part 6: Exposure of wood coatings to artificial weathering using fluorescent UV lamps and water
Paints and varnishes - Coating materials and coating systems for exterior wood - Part 6: Exposure of wood coatings to artificial weathering using fluorescent UV lamps and water
This part of EN 927 specifies a method for determining the resistance of wood coatings to artificial weathering performed in an apparatus equipped with fluorescent UV lamps, condensation and water spray devices.
Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im Außenbereich - Teil 6: Künstliche Bewitterung von Holzbeschichtungen mit fluoreszierenden UV-Lampen und Wasser
Dieser Teil von EN 927 legt ein Verfahren zum Bestimmen der Beständigkeit von Holzbeschichtungen gegen
künstliche Bewitterung in Geräten mit UV-Leuchtstofflampen, Kondensation und Sprüheinrichtungen für
Wasser fest.
Peintures et vernis - Produits de peinture et systemes de peinture pour bois en extérieur - Partie 6 : Vieillissement artificiel des revetements pour bois par exposition a des lampes UV fluorescentes et a de l'eau
La présente partie de l’EN 927 spécifie une méthode permettant de déterminer la résistance des revetements
pour bois au vieillissement artificiel, dans un appareillage équipé de lampes UV fluorescentes et de dispositifs
de condensation et de pulvérisation d’eau.
Barve in laki - Premazi in premazni sistemi za zunanjo zaščito lesa - 6. del: Izpostava premazov za les umetnemu staranju s fluorescentnimi UV svetilkami in vodo
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 927-6:2007
01-januar-2007
%DUYHLQODNL3UHPD]LLQSUHPD]QLVLVWHPL]D]XQDQMR]DãþLWROHVDGHO
,]SRVWDYDSUHPD]RY]DOHVXPHWQHPXVWDUDQMXVIOXRUHVFHQWQLPL89VYHWLONDPLLQ
YRGR
Paints and varnishes - Coating materials and coating systems for exterior wood - Part 6:
Exposure of wood coatings to artificial weathering using fluorescent UV lamps and water
Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im
Außenbereich - Teil 6: Künstliche Bewitterung von Holzbeschichtungen mit
fluoreszierenden UV-Lampen und Wasser
Peintures et vernis - Produits de peinture et systemes de peinture pour bois en extérieur
- Partie 6 : Vieillissement artificiel des revetements pour bois par exposition a des
lampes UV fluorescentes et a de l'eau
Ta slovenski standard je istoveten z: EN 927-6:2006
ICS:
71.100.50 .HPLNDOLMH]D]DãþLWROHVD Wood-protecting chemicals
87.040 Barve in laki Paints and varnishes
SIST EN 927-6:2007 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
EN 927-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2006
ICS 87.040
English Version
Paints and varnishes - Coating materials and coating systems
for exterior wood - Part 6: Exposure of wood coatings to artificial
weathering using fluorescent UV lamps and water
Peintures et vernis - Produits de peinture et systèmes de Beschichtungsstoffe - Beschichtungsstoffe und
peinture pour bois en extérieur - Partie 6 : Vieillissement Beschichtungssysteme für Holz im Außenbereich - Teil 6:
artificiel des revêtements pour bois par exposition à des Künstliche Bewitterung von Holzbeschichtungen mit
lampes UV fluorescentes et à de l'eau fluoreszierenden UV-Lampen und Wasser
This European Standard was approved by CEN on 26 June 2006.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 927-6:2006: E
worldwide for CEN national Members.
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EN 927-6:2006 (E)
Contents
Page
Foreword.3
Introduction .4
1 Scope .5
2 Normative references .5
3 Principle.5
4 Apparatus .6
4.1 Test chamber.6
4.2 Lamps .6
4.3 Device for wetting the test panels.6
4.4 Black panel thermometer.7
4.5 Irradiance control.7
5 Test panels .7
5.1 Wood .7
5.2 Preparation and selection of wood panels .8
5.3 Preparation of coated panels .8
6 Procedure .9
6.1 Examination before exposure .9
6.2 Mounting the test panels .9
6.3 Exposure.9
6.4 Examination of test panels .10
7 Precision.11
8 Expression of results and test report.11
Annex A (normative) Details of test methods.12
A.1 Gloss and change of gloss .12
A.2 Colour and colour change .12
A.3 Blistering .12
A.4 Flaking .12
A.5 Cracking.12
A.6 Chalking.12
A.7 General appearance .13
A.8 Adhesion.13
A.8.1 General.13
A.8.2 Apparatus and material.13
A.8.3 Procedure .13
Annex B (informative) Explanatory notes .14
B.1 Explanation of exposure cycle.14
B.2 Reproducibility.14
B.3 Correlation to natural weathering .14
B.4 Dependency on wood species and substrate.14
B.5 Recommendation of periodical performance assessments .14
Annex C (informative) Test for heartwood in pine .15
Annex D (informative) Water treatment, devices for water purification.16
Annex E (normative) Test for abnormally porous wood.17
Annex F (informative) Alternative procedure for preparation and coating of panels .18
Bibliography .19
2
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EN 927-6:2006 (E)
Foreword
This document (EN 927-6:2006) has been prepared by Technical Committee CEN/TC 139 “Paints and varnishes”,
the secretariat of which is held by DIN.
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 February 2007, and conflicting national standards shall be withdrawn at the latest
by February 2007.
EN 927 consists of the following parts under the general title "Paints and varnishes — Coating materials and
coating systems for exterior wood":
Part 1: Classification and selection;
Part 2: Performance specification;
Part 3: Natural weathering test;
Part 5: Assessment of the liquid water permeability;
Part 6: Exposure of wood coatings to artificial weathering using fluorescent UV lamps and water.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, 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.
3
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EN 927-6:2006 (E)
Introduction
Coatings from paints, varnishes and similar materials are weathered in a laboratory in order to simulate ageing
processes which occur from natural weathering. Generally, a valid correlation between ageing during artificial and
natural weathering cannot be expected due to a large number of influencing factors. Certain relationships can only be
expected if the effect of the important parameters (spectral distribution of the irradiance in the photochemically
relevant range, temperature of the specimen, type of wetting, wetting cycle relative humidity) on the coating is known.
However, unlike natural weathering, testing in the laboratory is carried out taking into consideration a limited number
of variables which can be controlled and therefore the results are more reproducible.
4
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EN 927-6:2006 (E)
1 Scope
This part of EN 927 specifies a method for determining the resistance of wood coatings to artificial weathering
performed in an apparatus equipped with fluorescent UV lamps, condensation and water spray devices.
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 927-1, Paints and varnishes — Coating materials and coating systems for exterior wood — Part 1:
Classification and selection
EN ISO 2409, Paints and varnishes — Cross-cut test (ISO 2409:1992)
EN ISO 2808, Paints and varnishes — Determination of film thickness (ISO 2808:1997)
EN ISO 2813, Paints and varnishes — Determination of specular gloss of non-metallic paint films at 20°, 60° and
85° (ISO 2813:1994, including Technical Corrigendum 1:1997)
EN ISO 4628-1:2003, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and
size of defects, and of intensity of uniform changes in appearance — Part 1: General introduction and designation
system (ISO 4628-1:2003)
EN ISO 4628-2, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size
of defects, and of intensity of uniform changes in appearance — Part 2: Assessment of degree of blistering
(ISO 4628-2:2003)
EN ISO 4628-4, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size
of defects, and of intensity of uniform changes in appearance — Part 4: Assessment of degree of cracking
(ISO 4628-4:2003)
EN ISO 4628-5, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size
of defects, and of intensity of uniform changes in appearance — Part 5: Assessment of degree of flaking
(ISO 4628-5:2003)
EN ISO 4628-6, Paints and varnishes — Evaluation of degradation of paint coatings — Designation of intensity,
quantity and size of common types of defect - Part 6: Rating of degree of chalking by tape method
(ISO 4628-6:1990)
prEN ISO 11507:2005, Paints and varnishes — Exposure of coatings to artificial weathering — Exposure to
fluorescent UV and water (ISO/DIS 11507:2005)
ISO 554, Standard atmospheres for conditioning and/or testing — Specifications
ISO 7724-1, Paints and varnishes — Colorimetry — Part 1: Principles
ISO 7724-2, Paints and varnishes — Colorimetry — Part 2: Colour measurement
3 Principle
Artificial weathering of coatings using fluorescent UV lamps, condensation or water spray is carried out in order to
produce a certain radiant exposure or mutually agreed total number of operation hours, based on a given degree of a
change in a property or properties. The properties of the exposed coatings are compared with those of unexposed
coatings, which are prepared from the same coating materials under identical conditions or with coatings whose
degradation properties are known.
5
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EN 927-6:2006 (E)
Radiation, temperature and humidity all contribute to the ageing process. Therefore, the apparatus specified in this
standard simulates all three factors.
The results obtained by this method do not necessarily directly relate to the results obtained under natural exposure
conditions. The relationship between these results needs to be established before the method can be used to predict
performance.
The standard test substrate is pine sapwood with the back side of panels coated. However, supplementary
information on coating performance may be obtained by conducting optional tests on additional wood species, on
pine, modified or impregnated by industrial processes or without coating the back side of the panels.
4 Apparatus
4.1 Test chamber
The test chamber consists of an enclosure made from corrosion-resistant material which houses the lamps, a heated
water tray, spray nozzles and test panel racks.
4.2 Lamps
A UV lamp emits UV light from a low pressure mercury arc. The required spectral distribution is achieved by careful
selection of the type of phosphor coating on the inner surface of the lamp and the nature of the glass used in the
construction of the tubes.
The lamp shall be of the following type:
Lamp, commonly called UV-A 340, with a peak emission at 340 nm and the following relative spectral irradiance (see
prEN ISO 11507:2005, lamp type 2):
Table 1 — Relative spectral irradiance of lamp
a
Wavelength Relative spectral irradiance
nm %
100
290 < λ ≤ 400
0,0
λ ≤ 290
0,2
290 < λ ≤ 300
Note: Broader band pass below
6,2 to 8,6
300 < λ ≤ 320
27,1 to 30,7
320 < λ ≤ 340
34,2 to 35,4
340 < λ ≤ 360
19,5 to 23,7
360 < λ ≤ 380
6,6 to 7,8
380 < λ ≤ 400
a
The spectral irradiance between 290 nm and 400 nm is defined as 100 %.
4.3 Device for wetting the test panels
The test panels shall be wetted by condensation from the heated water tray and by spray. To prevent spotting on to
the test panels, water with a pH value between 5,0 and 7,5 and an electrical conductivity of maximum 2 mS/m,
measured at (25 ± 1) °C shall be used. See Annex D.
6
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EN 927-6:2006 (E)
4.4 Black panel thermometer
Set the apparatus to operate at the specified parameters. The temperature shall be monitored by a remote sensor
attached to the black panel. The black panel thermometer shall be exposed to the same exposure conditions as the
specimens. Black panel thermometers shall be calibrated in accordance with the manufacturer’s recommendations.
4.5 Irradiance control
The irradiance at 340 nm shall be set to 0,89 W/(m²nm) (see 6.3.1).
Apparatus equipped with an irradiance control system shall be calibrated in accordance with the manufacturer’s
recommendations.
Lamps within the apparatus without an irradiance control system need to be rotated and replaced in accordance with
the manufacturer’s recommendations to compensate for lamp ageing.
5 Test panels
5.1 Wood
The wood shall be Scots Pine (Pinus sylvestris) that has been selected free of knots, cracks and resinous streaks, to
be straight-grained and of normal growth
...
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