PD CEN/TS 16498:2013 PDF

Scope: 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).

PD CEN/TS 16498:2013 Referenced Document

EN 927-5:2006 Paints and varnishes - Coating materials and coating systems for exterior wood - Part 5: Assessment of the liquid water permeability
ISO 3131:1975 Wood; Determination of density for physical and mechanical tests
ISO 554:1976 Standard atmospheres for conditioning and/or testing; Specifications
ISO 7724-2:1984 Paints and varnishes; Colorimetry; Part 2 : Colour measurement

2013 PD CEN/TS 16498:2013 Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment of tannin staining