Description
The hardness pencil scratch the surface of the coating film to test the surface hardness of the coating film layer, hardness pencil fixed at an angle of 45º, so that the front end of the pencil center and the surface of the coating film layer in contact with the appropriate load, according to a certain speed (JIS standard 0.5mm / s) to move the test platform so that the surface of the coating film layer moving through the pencil center, the coating film layer will not cause damage (scratch) the softest pencil grade can be considered as the coating film Layer hardness.