ISO 2815:1973

Paints and varnishes — Buchholz indentation test

Specifies a method for the indentation test under well-defined conditions on a single coating or multicoat system of coating materials or related products. It shall used a specified instrument (Buchholz). The length of the indentation is indicative of the residual deformation of the paint film. The result is expressed as a function of the reciprocal of the indentation length. The test gives results which may be dependent upon time, temperature and humidity. The indentation depth depends upon the film thickness; the result is only valid if the coating thickness exceeds a minimum value.