The document describes the procedure for determining the relative hardness of an organic coating on a metallic substrate, by means of pencils of know hardness. Smooth surfaces will give more accurate results but the method is also applicable for textured surfaces. The more pronounced the texture, the greater the unreliability of results.
DIN EN 13523-4:2001 history
2014DIN EN 13523-4:2014-10 Coil coated metals - Test methods - Part 4: Pencil hardness; German version EN 13523-4:2014
2014DIN EN 13523-4:2014 Coil coated metals - Test methods - Part 4: Pencil hardness; German version EN 13523-4:2014
2001DIN EN 13523-4:2001 Coil coated metals - Test methods - Part 4: Pencil hardness; German version EN 13523-4:2001