EN ISO 2810:2020

SLOVENSKI STANDARD
01-november-2020
Nadomešča:
SIST EN ISO 2810:2005
Barve in laki - Naravno staranje premazov - Izpostavljanje in ocenjevanje (ISO
2810:2020)
Paints and varnishes - Natural weathering of coatings - Exposure and assessment (ISO
2810:2020)
Beschichtungsstoffe - Freibewitterung von Beschichtungen - Bewitterung und Bewertung
(ISO 2810:2020)
Peintures et vernis - Vieillissement naturel des revêtements - Exposition et évaluation
(ISO 2810:2020)
Ta slovenski standard je istoveten z: EN ISO 2810:2020
ICS:
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 2810
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2020
EUROPÄISCHE NORM
ICS 87.040 Supersedes EN ISO 2810:2004
English Version
Paints and varnishes - Natural weathering of coatings -
Exposure and assessment (ISO 2810:2020)
Peintures et vernis - Vieillissement naturel des Beschichtungsstoffe - Freibewitterung von
revêtements - Exposition et évaluation (ISO Beschichtungen - Bewitterung und Bewertung (ISO
2810:2020) 2810:2020)
This European Standard was approved by CEN on 28 August 2020.

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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2810:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 2810:2020) has been prepared by Technical Committee ISO/TC 35 "Paints and
varnishes" in collaboration with 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 March 2021, and conflicting national standards shall
be withdrawn at the latest by March 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 2810:2004.
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, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 2810:2020 has been approved by CEN as EN ISO 2810:2020 without any modification.

INTERNATIONAL ISO
STANDARD 2810
Third edition
2020-09
Paints and varnishes — Natural
weathering of coatings — Exposure
and assessment
Peintures et vernis — Vieillissement naturel des revêtements —
Exposition et évaluation
Reference number
ISO 2810:2020(E)
©
ISO 2020
ISO 2810:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 2810:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General . 1
5 Exposure racks . 2
6 Apparatus for measurement of climatic factors . 3
6.1 Measurement of solar radiation . 3
6.1.1 Pyranometers . 3
6.1.2 Pyrheliometers . 3
6.1.3 Total-ultraviolet radiometers. 4
6.1.4 Narrow-band ultraviolet radiometers . 4
6.2 Other climate-measuring instruments . 4
7 Test specimens. 4
8 Procedure. 5
9 Supplementary test conditions . 5
10 E valuation of properties . 6
11 Precision . 6
12 Test report . 6
Annex A (normative) Environment and climate . 8
Annex B (informative) Classification of climates .10
Bibliography .12
ISO 2810:2020(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee
SC 9, General test methods for paints and varnishes, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 139, Paints and varnishes, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 2810:2004), which has been technically
revised. The main changes compared to the previous edition are as follows:
— in Clause 4, the list in b) has been amended by radiant exposure and temperature;
— the time of wetness has been deleted from the list of additional observations on climate in A.2 and
replaced by a note with the reference to ASTM Practice G84;
— the climate classification in Annex B has been updated to ISO 877-1:2009;
— the text has been editorially revised and the normative references have been updated.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 2810:2020(E)
Paints and varnishes — Natural weathering of coatings —
Exposure and assessment
1 Scope
This document specifies the conditions to take into consideration when selecting the type of natural
weathering and the natural weathering procedure to determine the resistance of coatings or coating
systems (direct weathering or weathering behind window glass).
Natural weathering is used to determine the resistance of coatings or coating systems (denoted in this
document by coatings) to the sun's radiation and the atmosphere.
This document does not take into account special atmospheric influences, e.g. industrial pollution.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1514, Paints and varnishes — Standard panels for testing
ISO 2808, Paints and varnishes — Determination of film thickness
ISO 4618, Paints and varnishes — Terms and definitions
WMO Publication No, 8, Guide to meteorological instruments and methods of observation, World
Meteorological Organization, Geneva, 2012
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
durability
ability of a specimen to resist the deleterious effect of its environment
3.2
time of wetness
period during which an exposed coating has surface moisture present on it
4 General
The durability of a coating during natural weathering depends on how, where and when the coating is
weathered. Therefore, these parameters and the intended use of the coating shall be taken into account
when exposures are carried out.
ISO 2810:2020(E)
In particular, the following parameters shall be considered:
a) the location of the exposure site, for example industrial, marine, rural; in choosing sites, those
which differ markedly in the type or level of pollution from the normal shall be avoided, unless they
are appropriate to the intended end use of the coating under test;
b) the height, angle and orientation of the exposure rack; these parameters govern the extent to
which the specimens are affected, for example by radiant exposure, temperature, dew, frost and
atmospheric pollutants;
c) the nature of the terrain on which the rack is constructed (for example concrete, grass, gravel);
the terrain may affect the climatic conditions around the specimen under test; it would rarely be
feasible to select an ideal terrain in practice, but the effect of such variations in climatic conditions
will be minimized by ensuring that all specimens are situated sufficiently high above the ground
(see Clause 5);
d) whether the performance of the coating on the front and/or the back of the specimen is of interest;
certain types of degradation, for example rust formation and/or mould growth, are frequently
more severe on the shaded parts of the specimen;
e) the intended use of the coating, including its substrate, and whether the coating is to be washed or
polished in service.
The results of tests on an exposure rack apply precisely only to the environment in which they were
obtained.
Provided that the test conditions are reasonably appropriate to the intended end use, the relative
performance of a number of coatings tested at the same time enables valid deductions to be drawn. It is
recommended that each series of specimens under evaluation include coatings of known performance
to act as reference standards.
The results of natural weathering may vary according to the time of year during which the tests are
carried out. The influence of these variations is reduced if the exposure period is sufficiently long. The
exposure period should be at least one year, or a multiple of one year. The reproducibility of the results
is improved if the exposure period always starts at the same time of year, preferably in spring.
Natural weathering tests are normally carried out for a fixed period of time. However, in many cases
it is preferable to define the test period in terms of a certain degree of degradation or by the radiant
exposure (dosage) of solar radiation to which the specimen is to be subjected (see Clause 6). The latter
procedure can reduce the influence of seasonal variations but does not eliminate it.
Radiant exposure can be determined by measurement of irradiance, and integration of the
measurements over the period of natural weathering.
The climatic conditions shall be monitored, and a complete record shall be reported, together with the
other conditions of weathering.
Care is required in the selection of test specimens of substrates with variable (anisotropic) properties,
for example wood or steel. In these cases, replication of the tests is essential to avoid misleading results.
Washing and polishing during exposure affects the durability of the coating. It shall therefore be
mentioned in the test report.
5 Exposure racks
Unless otherwise specified or agreed, use exposure racks on which the specimens are facing towards
the equator. The specimens shall be firmly held on the racks by attachments made of stainless steel or
other corrosion-resistant material, in such a manner that they are mechanically stressed as little as
possible.
2 © ISO 2020 – All rights reserved

ISO 2810:2020(E)
The exposure racks shall be constructed so that the atmosphere has free access to the specimens and
that water that drains from one specimen does not drain onto another. In addition, the racks can be
designed so that a portion of the specimens can be covered to allow evaluation between an exposed and
a masked area. By using special devices, particular conditions may be simulated, for example by using a
“black box” in accordance with SAE J 1976 to simulate automotive conditions or backing the test panel
with plywood or other insulation material to simulate building side wall or roof area conditions.
Metal substrates for corrosion tests shall not be in electrical contact with metals during the exposure
period or, as far as possible, in direct contact with wood or other porous materials. If specimens are
supported in grooves, suitable drainage holes shall be provided to prevent accumulation of water.
Unless otherwise stated, the racks shall be constructed so that all specimens are supported either at a
minimum height of 0,45 m above the ground or at a height sufficient to avoid contact with vegetation
and to prevent damage.
The area beneath and in the vicinity of the racks shall be characterized by low reflectance and by
ground cover typical of that climatological area. In desert areas, the racks shall be located on gravel, in
most temperate areas on low-cut grass.
Usually the panels are supported at an angle of 45° to the horizontal. Depending on the intended end
use of the coating, other angles may be agreed, for example 5° for automotive finishes or roof coatings,
or vertical exposure for textured wall finishes.
NOTE When testing corrosion performance, it is appropriate to expose specimens vertically facing away
from the equator as well as inclined at 45° and 5° facing towards the equator (see EN 13523-19).
Specimens facing away from the equator will remain wet for longer periods since they dry less rapidly
than those exposed facing towards the equator. This leads to a higher tendency to corrode.
The racks shall be situated so that, at a sun height of 20° and more, no shadow falls on to the specimens.
When testing the durability of coatings for interior use which are exposed to radiation which has
passed
...