The pur­pose of Pencil Hard­ness Tester is to determine the resistance of coating mate­rials or lacquers to scratch effects on the surface. This test is of particular value for furniture or vehicle lacquers, but is also a useful aid in the development of synthetic resins or other film forming materials.

Generally, scratch hardness is measured by moving a sharp object under a known pressure over the test surface. The result may either be the value of the pressure required to scratch through the test material if a scratching tool of constant hardness is used, or the hardness of the scratching tool is varied while constant pressure is applied.

Pencils are moved with a fixed pressure(500g/750g/1000g)and a fixed angle ensuring the least amount of operator error.

Pencils can be easily exchanged to minimize down time during the test

ASTM D3363, ECCA-T4-1, BS 3900-E19, ISO 15184.

Three points are touched on the tested surface (roller, pencil lead）
The angle between pencil and the tested surface: 45°
Pressure of pencil lead :500g/ 750g//1000g
Pencil: 6B-6H Total 13 pcs