SIST-TS CEN/TS 927-15:2025

SLOVENSKI STANDARD
01-januar-2025
Barve in laki - Premazi in premazni sistemi za zaščito lesa za zunanjo uporabo - 15.
del: Ocenjevanje odpornosti premazov proti obarvanju zaradi lesnih ekstraktivov z
metodo potapljanja v vodo
Paints and varnishes - Coating materials and coating systems for exterior wood - Part
15: Assessment of bleeding of coloured wood extractives through a coating by means of
a water immersion test
Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im
Außenbereich - Beurteilung von unerwünschten Verfärbungen aufgrund von
Holzinhaltsstoffen mittels Wassertauchprüfung
Peintures et vernis - Produits de peinture et systèmes de peinture pour le bois en
extérieur - Évaluation de la migration des extractibles colorés du bois à travers un
revêtement à l’aide d’un essai d’immersion dans l’eau
Ta slovenski standard je istoveten z: CEN/TS 927-15:2024
ICS:
71.100.50 Kemikalije za zaščito lesa Wood-protecting chemicals
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TS 927-15
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
October 2024
TECHNISCHE SPEZIFIKATION
ICS 87.040
English Version
Paints and varnishes - Coating materials and coating
systems for exterior wood - Part 15: Assessment of
bleeding of coloured wood extractives through a coating
by means of a water immersion test
Peintures et vernis - Produits de peinture et systèmes Beschichtungsstoffe - Beschichtungsstoffe und
de peinture pour le bois en extérieur - Partie 15 - Beschichtungssysteme für Holz im Außenbereich - Teil
Évaluation de la migration des extractibles colorés du 15: Beurteilung von unerwünschten Verfärbungen
bois à travers un revêtement à l'aide d'un essai aufgrund von Holzinhaltsstoffen mittels
d'immersion dans l'eau Wassertauchprüfung
This Technical Specification (CEN/TS) was approved by CEN on 1 August 2024 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

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, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 927-15:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Apparatus and materials . 5
5 Procedure . 6
6 Test report . 8
Bibliography . 9
European foreword
This document (CEN/TS 927-15:2024) has been prepared by Technical Committee CEN/TC 139 “Paints
and varnishes”, the secretariat of which is held by DIN.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to announce this Technical Specification: 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, Türkiye and the
United Kingdom.
Introduction
Coatings on exterior wood surfaces have both decorative and protective functions. A valued function of
the coating system is to protect against discoloration (tannin staining) caused by the presence of coloured
wood extractives migrating in the coating from the wood material. Tannin staining can occur at different
stages, including shortly after coating application and at later stages in use, when driving forces like
fluctuating humidity are present.
1 Scope
This document specifies a test method using water immersion test for assessing the bleeding of coloured
wood extractives through a coating. Leachates of coated and uncoated wood are collected after the
immersion procedure and their colour is compared. The colour of the coated wood before and after
immersion tests is also compared. This document does not specify acceptance values for colour
differences that can be tolerated and it is not applicable to staining caused by knots for which there is a
different test method (see EN 927-7).
NOTE The method has bee
...