Use this simple tool to determine the hardness and scratch resistance of a coating. A pencil of known hardness is held at a 45° angle and moved across a coated surface at 1mm/s while applying a known pressure (7.5N /1.68lbf / 750g). The resistance of a coating (also known as its pencil hardness) is indicated by the grade of the hardest pencil that does not permanently mark the coating. See the table below for a list of ranking of pencils by hardness.

Features

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• Easy to use
• All manual
• Low cost

Pencil Hardness Specifications

• Pressure of Pencil Tip 7.5N /1.68lbf / 750g
• 45° angle between pencil and surface to be tested
• Tested surface is touched at three points –2 rollers, and pencil tip
• 14 pcs. Mitsubishi brand pencils, from 6H to 6B

Standards

• ASTM D3363 and ISO15184