Test: ASTM D3363
Test Summary: ASTM D3363 "Standard Test Method for Film Hardness by Pencil Test" measures the gouge and scratch hardness of a coating. Gouge and Scratch is measured by using different grades of pencil lead to cut through the coating surface. To conduct this test, a coated panel is placed on a flat, horizontal surface. A weighted trolley is loaded with the hardest pencil lead (9h), placed on the panel and pushed away from the operator for a length of 6.5 mm. This process is repeated until a lead is found that will not cut through the coating to the substrate for a distance of 3 mm (gouge hardness). The process is then continued until a lead is found that will not cut nor scratch the coating (scratch hardness).