PD CEN/TS 16498:2013

This standard PD CEN/TS 16498:2013 Paints and varnishes. Coating materials and coating systems for exterior wood. Assessment of tannin staining is classified in these ICS categories:

• 87.040 Paints and varnishes

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).