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SRPS CEN/TS 16498:2014

Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment of tannin staining

Apr 30, 2014

General information

90.93     May 25, 2022

90.00    May 25, 2025



Technical Specification



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This Technical Specification specifies a test method for assessing the discoloration of coatings on wood by tannin staining due to wood extractives. The method uses an extract from Merbau wood as an indicator. Bleeding of wood extractives is assessed at two specified stages firstly after coating application and secondly after cyclic climate exposure. A qualification of colour differences that can be attributed to three different causes, bleeding of extractives, low opacity of the coating film or general yellowing in climate exposure, is included. 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 (e. g. CEN/TS 16359).

Life cycle


SRPS CEN/TS 16498:2014
90.93 Standard confirmed
May 25, 2022

Related project

Adopted from CEN/TS 16498:2013