This part of EN 13523 describesThe procedure for determiningmetallic substrate, by means of pencils of known hardness.Smooth surfaces will give more accurate results butThe methodpronouncedThe texture,The greaterThe unreliability of results.the relative hardness of an organic coating on ais also applicable for textured surfaces.The more
EN 13523-4:2001 history
2014EN 13523-4:2014 Coil coated metals - Test methods - Part 4: Pencil hardness
2001EN 13523-4:2001 Coil Coated Metals - Test Methods - Part 4: Pencil Hardness