Pencil hardness test – also known as scratch hardness test according to Wolff-Wilborn. Fast and uncomplicated test for testing surfaces.
A pencil is drawn over a coated surface at an angle of 45°. The pencil is pressed onto the component with a certain force. A distinction is made between the pencil hardness that leaves only a writing trace on the test object and the pencil hardness that leaves a scratch on the component.
ASTM D 3363 also refers to groove hardness and scratch hardness.
Standards: ASTM D 3363, BS 3900-E19, ISO 15184, JIS K 5600-5-4, SES N3243
