Paints and varnishes. Determination of scratch resistance - Constant-loading method
Paints and varnishes. Determination of scratch resistance - Constant-loading method
BS EN ISO 1518-1:2011 Paints and varnishes. Determination of scratch resistance. Constant-loading method This part of BS EN ISO 1518 specifies a test method for determining under defined conditions the resistance of a single coating or a multi-coat system of paint, varnish or related product to penetration by scratching with a scratch stylus loaded with a specified load. Penetration of the stylus is to the substrate, except in the case of a multi-coat system, in which case the stylus can penetrate either to the substrate or to an intermediate coat. The method specified can be carried out a) either as a “pass/fail” test, by testing with a single specified load applied to the stylus to assess compliance with a particular specification
b) or by applying increasing loads to the stylus to determine the minimum load at which the coating is penetrated.
What are the main changes I need to know about for this standard?
A principle clause has been added Two versions of the test apparatus are now described The minimum length of the scratch has been reduced from 60mm to 40mm The magnification of the lens used to examine the scratch has been specified as at least x4 The supplementary test conditions have been integrated in the test report A clause on precision has been added
ISO 1518 consists of the following parts, under the general title Paints and varnishes. Determination of scratch resistance:
Part 1: Constant-loading method Part 2: Variable-loading method
Contents of BS EN ISO 1...
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