Coating Terms

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Test method used to determine the surface hardness of a dry organic coating film using a pencil with standart hardness. For pencil hardness test, pencils of following standarts are used arranged in increasing hardness level: 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H. Coated surface is scratched with a pencil tip, square shaped with sand paper. A coating’s pencil hardness is defined as the hardness that is one level softer than the softest pencil leaving a permanent mark on the surface.