Pencil Hardness tester
The Pencil Hardness tester is the most common but also the most inconsistent technique to measure the hardness of a coating. This test conduct scratch hardness tests to determine the resistance of coating material in order to prevent the scratches on the surface.
In the test, Pencils of various degrees of hardness are move over the surface under a Fix Pressure and angle to the surface. The degree of hardness of the Pencil which damages the surface is take as a measurement of scratch hardness e.g. “3H” Hardness
- Pencil Guide with Imported Staedtler German or Uni Mitsubishi Japanese 12/20 Pencils.
- Pencils 9B,8B,7B,6B,5B,4B,3B,2B,B,HB,F,H,2H,3H, 4H,5H,6H,7H,8H,9H
Standard : ASTMD 3363, ISO – 15184