Plastics - Decorative solid surfacing materials - Part 3: Determination of properties - Solid surface shapes (ISO 19712-3:2007)

ISO 19712-3:2007 specifies the methods of test for determination of the properties of solid surfacing materials in the form of shaped products. These methods are primarily intended for testing the materials specified in ISO 19712‑1.

Kunststoffe - Dekorative Mineralwerkstoffe - Teil 3: Prüfverfahren - Formteile (ISO 19712-3:2007)

Der vorliegende Teil der ISO 19712 legt Prüfverfahren zur Bestimmung der Eigenschaften von verschiedenen Formteilen aus Mineralwerkstoffen fest, die in Abschnitt 3 definiert sind. Diese Verfahren sind hauptsächlich zur Prüfung der in ISO 19712-1 festgelegten Werkstoffe vorgesehen.
Die Prüfungen können an fertigen Erzeugnissen durchgeführt werden, werden jedoch im Allgemeinen an Prüf-platten vorgenommen, deren Größe ausreichend ist, um die Prüfanforderungen zu erfüllen und die aus dem gleichen Material bestehen und die gleiche Oberflächenbeschaffenheit aufweisen, wie die fertigen Erzeug-nisse.

Plastiques - Matériaux décoratifs massifs de revêtement de surface - Partie 3: Détermination des propriétés - Produits mis en forme (ISO 19712-3:2007)

L'ISO 19712-3:2007 spécifie les méthodes d'essai pour la détermination des propriétés des matériaux massifs de revêtement de surface sous forme de produits formés. Ces méthodes sont principalement destinées à la réalisation des essais sur les matériaux spécifiés dans l'ISO 19712-1.

Polimerni materiali - Dekorativni trdni površinski materiali - 3. del: Ugotavljanje lastnosti - Oblika (ISO 19712-3:2007)

General Information

Status
Withdrawn
Publication Date
15-Jan-2013
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
13-Apr-2022

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SLOVENSKI STANDARD
SIST EN ISO 19712-3:2014
01-februar-2014

Polimerni materiali - Dekorativni trdni površinski materiali - 3. del: Ugotavljanje

lastnosti - Oblika (ISO 19712-3:2007)

Plastics - Decorative solid surfacing materials - Part 3: Determination of properties - Solid

surface shapes (ISO 19712-3:2007)

Kunststoffe - Dekorative Mineralwerkstoffe - Teil 3: Prüfverfahren - Formteile (ISO 19712

-3:2007)
Plastiques - Matériaux décoratifs massifs de revêtement de surface - Partie 3:
Détermination des propriétés - Produits mis en forme (ISO 19712-3:2007)
Ta slovenski standard je istoveten z: EN ISO 19712-3:2013
ICS:
83.140.20 /DPLQDWQHSORãþH Laminated sheets
SIST EN ISO 19712-3:2014 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 19712-3:2014
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SIST EN ISO 19712-3:2014
EUROPEAN STANDARD
EN ISO 19712-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2013
ICS 83.140.20
English Version
Plastics - Decorative solid surfacing materials - Part 3:
Determination of properties - Solid surface shapes (ISO 19712-
3:2007)

Plastiques - Matériaux décoratifs massifs de revêtement de Kunststoffe - Dekorative Mineralwerkstoffe - Teil 3:

surface - Partie 3: Détermination des propriétés - Produits Prüfverfahren - Formteile (ISO 19712-3:2007)

mis en forme (ISO 19712-3:2007)
This European Standard was approved by CEN on 22 December 2012.

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, Former Yugoslav Republic of Macedonia, 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

© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19712-3:2013: E

worldwide for CEN national Members.
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SIST EN ISO 19712-3:2014
EN ISO 19712-3:2013 (E)
Contents Page

Foreword ..............................................................................................................................................................3

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SIST EN ISO 19712-3:2014
EN ISO 19712-3:2013 (E)
Foreword

The text of ISO 19712-3:2007 has been prepared by Technical Committee ISO/TC 61 “Plastics” of the

International Organization for Standardization (ISO) and has been taken over as EN ISO 19712-3:2013 by

Technical Committee CEN/TC 249 “Plastics” 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 2013, and conflicting national standards shall be withdrawn at the

latest by July 2013.

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.

According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, 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.

Endorsement notice

The text of ISO 19712-3:2007 has been approved by CEN as a EN ISO 19712-3:2013 without any

modification.
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SIST EN ISO 19712-3:2014
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SIST EN ISO 19712-3:2014
INTERNATIONAL ISO
STANDARD 19712-3
First edition
2007-12-15
Plastics — Decorative solid surfacing
materials —
Part 3:
Determination of properties — Solid
surface shapes
Plastiques — Matériaux décoratifs massifs de revêtement de surface —
Partie 3: Détermination des propriétés — Produits mis en forme
Reference number
ISO 19712-3:2007(E)
ISO 2007
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SIST EN ISO 19712-3:2014
ISO 19712-3:2007(E)
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All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

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Published in Switzerland
ii © ISO 2007 – All rights reserved
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SIST EN ISO 19712-3:2014
ISO 19712-3:2007(E)
Contents Page

Foreword............................................................................................................................................................ iv

Introduction ........................................................................................................................................................ v

1 Scope ..................................................................................................................................................... 1

2 Normative references ........................................................................................................................... 1

3 Terms and definitions........................................................................................................................... 2

4 Cleaning the test specimen surface ................................................................................................... 2

5 Surface defects ..................................................................................................................................... 2

6 Resistance to impact by large-diameter ball .....................................................................................3

7 Lightfastness......................................................................................................................................... 5

8 Stain/chemical-resistance test .......................................................................................................... 10

9 Resistance to cigarette burns ........................................................................................................... 17

10 Resistance to dry heat........................................................................................................................ 25

11 Resistance to wet heat ....................................................................................................................... 31

12 Hot/cold-cycle water-resistance test ................................................................................................ 34

13 Hardness.............................................................................................................................................. 38

14 Ability to be renewed.......................................................................................................................... 38

Bibliography ..................................................................................................................................................... 39

© ISO 2007 – All rights reserved iii
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SIST EN ISO 19712-3:2014
ISO 19712-3:2007(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 19712-3 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 11, Products.

ISO 19712 consists of the following parts, under the general title Plastics — Decorative solid surfacing

materials:
⎯ Part 1: Classification and specifications
⎯ Part 2: Determination of properties — Sheet goods
⎯ Part 3: Determination of properties — Solid surface shapes
iv © ISO 2007 – All rights reserved
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SIST EN ISO 19712-3:2014
ISO 19712-3:2007(E)
Introduction

This part of ISO 19712 is intended for use by manufacturers, installers and specifiers of solid surfacing

materials.

The test methods and minimum performance values presented have been related as closely as possible to

end-use applications. The fabrication techniques employed may, however, have a bearing on product

performance and service.

The performance requirements include impact resistance, structure, renewability, colourfastness, cleanability,

stain resistance, water resistance, chemical resistance, bacterial and fungal resistance, and other significant

properties.
© ISO 2007 – All rights reserved v
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SIST EN ISO 19712-3:2014
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SIST EN ISO 19712-3:2014
INTERNATIONAL STANDARD ISO 19712-3:2007(E)
Plastics — Decorative solid surfacing materials —
Part 3:
Determination of properties — Solid surface shapes

SAFETY STATEMENT — Persons using this document should be familiar with normal laboratory

practice, if applicable. This document does not purport to address all of the safety problems, if any,

associated with its use. It is the responsibility of the user to establish appropriate safety and health

practices and to ensure compliance with any regulatory conditions.
1 Scope

This part of ISO 19712 specifies the methods of test for determination of the properties of solid surfacing

materials, as defined in Clause 3, in the form of shaped products. These methods are primarily intended for

testing the materials specified in ISO 19712-1.

The tests may be carried out on finished products, but are generally carried out on test panels of a size

sufficient to meet the requirements of the test, and of the same material and finish as the finished product.

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.

ISO 105-A02, Textiles — Tests for colour fastness — Part A02: Grey scale for assessing change in colour

ISO 105-B02, Textiles — Tests for colour fastness — Part B02: Colour fastness to artificial light: Xenon arc

fading lamp test
ISO 209:2007, Aluminium and aluminium alloys — Chemical composition
ISO 1770, Solid-stem general purpose thermometers

ISO 2039-1, Plastics — Determination of hardness — Part 1: Ball indentation method

ISO 2039-2, Plastics — Determination of hardness — Part 2: Rockwell hardness
ISO 3668, Paints and varnishes — Visual comparison of the colour of paints
ISO 4211:1979, Furniture — Assessment of surface resistance to cold liquids
ISO 4892:1981, Plastics — Methods of exposure to laboratory light sources

ISO 4892-1, Plastics — Methods of exposure to laboratory light sources — Part 1: General guidance

ISO 4892-2:2006, Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc sources

1) Withdrawn, but still used in certain Asian countries.
© ISO 2007 – All rights reserved 1
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SIST EN ISO 19712-3:2014
ISO 19712-3:2007(E)

ISO 9370, Plastics — Instrumental determination of radiant exposure in weathering tests — General guidance

and basic test method
CIE Publication No. 85:1989, Solar spectral irradiance

ASTM D 2244, Standard Practice for Calculation of Color Tolerances and Color Differences from

Instrumentally Measured Color Coordinates

ASTM D 2583, Standard Test Method for Indentation Hardness of Rigid Plastics by Means of a Barcol

Impressor
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
solid surfacing material
SSM

material, composed of polymeric materials together with pigments and fillers, intended to be cast into sheets

or shaped products

NOTE 1 The material is of the same composition throughout the whole thickness of the sheet or product.

NOTE 2 Sheets and products made from SSMs are repairable and renewable to the original finish.

NOTE 3 SSMs can also be fabricated into continuous sheets with inconspicuous seams.

4 Cleaning the test specimen surface
4.1 General

The surface to be tested shall be prepared prior to testing using the procedure specified in 4.3.

4.2 Materials
4.2.1 Cellulose sponge.
4.2.2 Non-abrasive cleanser, containing a bleaching agent.
4.2.3 Water.
4.2.4 Clean, absorbent, lint-free material.
4.3 Procedure

Clean the surface using a damp sponge and non-abrasive cleanser containing a bleaching agent, scrubbing

the surface with light hand pressure for up to 1,0 min/m . Rinse the prepared surface with water and dry with

clean, absorbent, lint-free material.
5 Surface defects
5.1 Procedure

The entire finished surface of the shaped product under test shall be rubbed with a sponge and a 50 %

solution of tap water and water-soluble black or blue-black ink after the surface has been washed and dried as

described in 4.3. When inspecting coloured sheets, contrasting-coloured ink shall be used. The ink shall be

wiped from the surface with a damp cloth and the surface dried before inspection.

2 © ISO 2007 – All rights reserved
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SIST EN ISO 19712-3:2014
ISO 19712-3:2007(E)
5.2 Method of inspection of surface

After being inked in accordance with 5.1, the surface of the shaped product shall be inspected with the

unaided eye for defects and blemishes from a distance of between 305 mm and 610 mm, using a light source

giving an illumination intensity of (1 615 ± 540) lx near the surface to be inspected.

5.3 Performance requirements

The finished surfaces of shaped products shall be free from cracks, chipped areas, pinholes and blisters.

Spots, dirt and similar surface blemishes are admissible provided the total area covered by such blemishes is

2 2

not more than 1,0 mm /m of the surface of the shaped product. The blemishes may be concentrated in one

place or scattered over the product.
5.4 Test report
The test report shall include the following information:
a) a reference to this part of ISO 19712;
b) the name and type of product;
c) whether the surface was free from cracks, chipped areas, etc.;
2 2

d) whether the area covered by spots, dirt, etc., was more than 1,0 mm /m of sheet surface;

e) any deviation from the method specified;
f) the date of the test.
6 Resistance to impact by large-diameter ball
6.1 Principle

While this test method can be used for any shaped product of suitable size and shape, it is intended

principally for sinks and is therefore written for that particular product.

A sink made of solid surface material is covered with a sheet of carbon paper and subjected to the impact of a

steel ball which is allowed to fall from a known height. The impact resistance is expressed as the maximum

drop height which does not incur visible surface cracking or chipping.
6.2 Test specimen
Sinks to be tested shall be taken from the finished-goods inventory.
6.3 Procedure

A 38,1-mm-diameter, 0,225 kg steel ball shall be dropped from a height of 610 mm to impact once on each of

four different areas in each sink compartment.

Two of these areas shall be on the flat area of the sink bottom, and the other two points shall be on the

convex rim radius.

Service sinks without rolled rims, and other cast products, shall be impacted only on the compartment bottom.

Impact locations for typical sink configurations shall be as shown in Figure 1.
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SIST EN ISO 19712-3:2014
ISO 19712-3:2007(E)

Additionally, the 0,225 kg steel ball shall be dropped to impact once on each of three different points on flat

areas of sinks with tops or integral tops and drainboards.

The sink shall be mounted in accordance with the manufacturer's instructions for normal use.

6.4 Performance requirement

The sink shall not show any cracks or chips after inking and inspection as described in 5.1 and 5.2.

6.5 Test report
The test report shall include the following information:
a) a reference to this part of ISO 19712;
b) the name and type of sink;
c) whether the sink showed any cracks or chips;
d) any deviation from the method specified;
e) the date of the test.
• impact points
Figure 1 — Point-of-impact locations
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SIST EN ISO 19712-3:2014
ISO 19712-3:2007(E)
7 Lightfastness
7.1 Method A
7.1.1 Principle

A specimen taken from the product under test is exposed to daylight simulated by the filtered light of one or

more xenon-arc lamps. The effect on the colour of the specimen, at a specified radiant exposure, is assessed

by the contrast between the exposed and unexposed portions of the test specimen. The radiant exposure is

determined both instrumentally and by assessing the effect on blue wool references which are exposed

simultaneously.

Daylight spectral distribution is specified since SSM products may, in certain applications, be exposed to

direct daylight through open windows.
7.1.2 Apparatus
7.1.2.1 Test device, as specified in ISO 4892-1 and ISO 4892-2, equipped with:

a) one or more xenon-arc lamps, filtered to provide a spectral energy distribution which closely

approximates to that of solar irradiance as described in CIE Publication No. 85:1989, Table 4, and

ISO 4892-2:2006, Table 1 (method A);

b) stainless-steel specimen holders, in the form of an open frame, which provide the test specimens with a

solid backing;
c) a black-standard thermometer as specified in ISO 4892-1;

d) a photoelectronic sensor (radiometer) of one of the types specified in ISO 9370 to measure the irradiance

and the radiant exposure at the specimen surface in the wavelength range 300 nm to 400 nm, or at

340 nm.

7.1.2.2 Viewing enclosure, having a matt interior colour corresponding approximately to Munsell N5. It

shall be equipped with an artificial light source, located at the top, simulating average north sky daylight (e.g.

tungsten-halogen incandescent lamps) and generating a colour temperature of (6 500 ± 200) K and at least

800 lx at the surface of the specimen. The viewing enclosure shall be placed in a position where the

surrounding lighting conditions will not affect the visual assessment of the specimen.

7.1.3 Test specimen

One test specimen shall be prepared, of a size suitable for the specimen holder used and appropriate for the

method of assessment after exposure.
7.1.4 Procedure

The test specimen and a set of blue wool references 5, 6 and 7 (as specified in ISO 105-B02) shall be

exposed simultaneously. Blue wool references 5 and 7 are included to provide confirmation that wool

reference 6 has degraded to the specified degree of contrast.

Using opaque stainless-steel covers, shield approximately one-half of both the test specimen and the set of

blue wool references.

Carry out the test in accordance with ISO 4892-2 under the following operating conditions:

a) irradiance at the test specimen surface in the wavelength range 300 nm to 400 nm: (60 ± 3) W/m ; or at

wavelength 340 nm: (0,5 ± 0,03) W/m ;
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SIST EN ISO 19712-3:2014
ISO 19712-3:2007(E)
b) black-standard temperature: (65 ± 3) °C;
c) relative humidity: (50 ± 5) %.

Discontinue the exposure when the contrast between the exposed and unexposed portions of blue wool

reference 6 is equal to grade 4 on the grey scale, as defined in ISO 105-A02 (see Note 1).

Measure and record the radiant exposure (over 300 nm to 400 nm, or at 340 nm).

Remove the test specimen from the apparatus, take off the cover, and leave the specimen for (24 ± 2) h in

dark conditions to prevent extraneous darkening and/or photochromism (see Note 2).

NOTE 1 Although the use of blue wool references is no longer the preferred method of measuring radiant exposure,

the method is still in common use and is therefore permitted. Once sufficient data have been collected, the end-point of

the test will be defined by the level of radiant exposure.

NOTE 2 Extraneous darkening and/or photochromism are due to the shock effect of accelerated exposure, and are not

characteristics of natural exposure. Keeping the specimens in dark conditions for 24 h allows recovery from these effects.

7.1.5 Assessment of specimen and expression of results
Place the test specimen in the viewing enclosure (7.1.2.2).

Examine the surface of the test specimen with the naked eye, corrected if necessary, at a distance of

approximately 500 mm for any change in colour, assessing the contrast between the exposed and unexposed

portions of the test specimen in terms of a grade on the grey scale in accordance with ISO 105-A02.

The lightfastness of the test specimen is expressed in terms of the contrast being greater than, equal to or

less than grade 4 on the grey scale.
7.1.6 Test report
The test report shall include the following information:
a) a reference to this part of ISO 19712;
b) the name, type and nominal thickness of the product;
c) details of the apparatus used;
d) the irradiance at the test specimen surface;
e) the radiant exposure;
f) the exposure time;
g) the lightfastness of the specimen;
h) any deviation from the method specified;
i) the date of the test.
7.2 Method B
7.2.1 Principle

The test assesses the effect on the colour of a test specimen of exposure to a filtered xenon-arc light source

having a frequency range simulating sunlight through window glass.

It is not intended to show the resistance to continuous exposure to outdoor weathering conditions.

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SIST EN ISO 19712-3:2014
ISO 19712-3:2007(E)
7.2.2 Materials
7.2.2.1 White petroleum jelly.
7.2.3 Apparatus

7.2.3.1 Suitable xenon-arc test apparatus, as specified in ISO 4892-1 and ISO 4892-2, capable of

providing radiant energy closely simulating sunlight, with a spectral passband of 280 nm to 800 nm and with

appropriate filtering to simulate daylight through window glass. The apparatus shall incorporate a system for

mounting specimen holders at an equal radial distance from the centre of the light source and revolving them

around the light source so as to provide equal radiant exposure.

7.2.3.2 Specimen holders, suitable for the test apparatus, and incorporating a mask to cover half of the

exposed face of the test specimen.

7.2.3.3 Overhead white fluorescent lights, with bulb(s) positioned parallel to the line of sight and

providing an intensity of 800 lx to 1 100 lx at the specimen surface.
7.2.4 Standardization of apparatus

Calibration, maintenance and filter changes shall be strictly in accordance with the equipment manufacturer's

recommendations.
The calibration wavelength for the xenon unit shall be 420 nm.
7.2.5 Test specimens

The test specimens shall be of the size specified for the test apparatus being used. The longest dimension of

the specimens shall be in the machine direction of the product.
7.2.6 Procedure

Mount each test specimen in a specimen holder (7.2.3.2) so that approximately one-half of the specimen is

exposed to the light source, the other half being covered by the mask. Fill all the specimen holders, utilizing

blanks if necessary, and keep them filled during the whole of the test in order to maintain correct airflow

conditions through the test chamber.
Carry out the test under the operating conditions specified in Table 1.

NOTE The setting of the wet-bulb temperature in relation to the dry-bulb temperature is designed to maintain a

relative humidity of (50 ± 5) %.

All test parameters shall be maintained as close as possible to the required settings.

Table 1 — Operating conditions
Parameter Setting Tolerance
2 2
Total irradiance 279,0 kJ/m ± 2,0 kJ/m
2 2
Irradiance level 1,10 W/m ± 0,03 W/m
Black-panel temperature 70 °C ± 3 °C
Dry-bulb temperature 50 °C ± 3 °C
Wet-bulb temperature 39 °C ± 1 °C
Conditioning-water temperature 20 °C ± 3 °C
Duration of exposure 72 h ± 1 %
Power adjustment Automatic To maintain steady irradiance levels, allowing for
ageing of xenon burners and solarization of filters
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SIST EN ISO 19712-3:2014
ISO 19712-3:2007(E)

The black-panel thermometer shall be mounted at the same distance from the light source as the test

specimen. The black coating shall be maintained in good condition in order to achieve as accurately as

possible the black-body temperature of the panel.

At the conclusion of the specified exposure period, remove the test specimens from their holders and allow

them to condition at room temperature for a period of 24 h.

After this conditioning period, examine each specimen within 4 h by placing the specimen on a horizontal

surface under the inspection lights (7.2.3.3) and viewing it at an eye-to-specimen distance of 750 mm to

900 mm, and at an angle of 45° to 75° from the horizontal plane. Rotate the specimen on the horizontal

surface and view it from all directions. Direct sunlight or other light sources which might accentuate or

minimize the visual effect shall be avoided.

If a difference in appearance is evident between the exposed and unexposed areas of the test specimen, coat

the surface of the specimen with a thin film of white petroleum jelly (7.2.2.1) and re-examine it. If the

difference persists, report the difference as a colour change; if it disappears, report it as a change in surface

finish.
7.2.7 Expression of results

Express the result of the examination in accordance with the following rating scale:

Rating 5: No change in colour or surface finish

Rating 4: A slight change in colour or surface finish visible only at certain viewing angles and

directions

Rating 3: A moderate change in colour or surface finish that is just visible at all viewing angles and

directions

Rating 2: A marked change in colour or surface finish that is very evident at all viewing angles and

directions
Rating 1: S
...

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