prEN 927-7

Paints and varnishes - Coating materials and coating systems for exterior wood - Part 7: Assessment of knot staining resistance prEN 927-7

Scope

This part of EN 927 specifies a test method for assessing the discoloration of coatings on wood due to resin exudation from knots. The discoloration is measured as a colour difference between the coated surface on the knot and the coated surface beside the knot.
The colour difference is measured in accordance with ISO 7724.
This standard does not specify a limit for an acceptable colour difference