Pencil hardness tester also been called as " Wolff-Wilborn ". It uses diflerent hardness graphite pencil to evaluate the coating hardness, the design ensures the cylindrical pencil keeping unalterable 45 degree and the same weight.
The core of the pencil should be prepared with pencil sharpener and sanding paper, then put into pencil hardness tester, also put on to the smooth and flat surface, the lowest hardness of pencil leaves traces on the coating to judge the level of hardness.
Pencil Hardness Tester with 3 Loadings
The purpose of pencil hardness tests 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.
Blending Knife
The Blendign Knife of different shapes and didfferent size can satisfy various working request for experimental chemists adjusting colour.
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