Pencil hardness tester

The Pencil Hardness Test according Wolff Wilborn provides in a simple method to test the scratch hardness of coatings.

In this test, pencils in a range of 6B to 8H hardness-grade are used.

The pencil is moved scratching over the surface under a 45° angle with a constant pressure.

Then an optical assessment is carried out to see which pencil hardness damages the surface.

Delivered with a set of 20 Koh-i-noor pencils and a pencil sharpener.

The models differ in load on the pencil tip (in grams). This differs per standard.