Pencil hardness test “scratch boy”


The scratchboy

A simple, reproducible and effective technique to evaluate the hardness of coatings and other surfaces, such as floor coverings.

  • The pencil lead is maintained at an angle of 45° and pushed with uniform pressure onto the sample, leaving either a superficial trace or causing destruction to the substrate.

Centexbel has adapted the apparatus to test the self-repairing properties of coating layers.

scratchboy detail