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Pencil Hardness Tester
This instrument offers an easy method for the determination of film hardness for coating applied to a flat substrate. The pencil lead, prepared beforehand by rubbing it on fine abrasive paper(400),is maintained at an angle of 45º and pushed with uniform pressure onto the sample, either leaving a superficial trace or causing destruction down to the substrate. It complies with the requirements of ASTM D 3363, ISO 15184.
Pencil Hardness Tester
Main Technical Parameters
■ Three points are touched on the tested surface (roller、pencil lead)
■ The angle between pencil and the tested surface: 45°
■ Built-in spirit bubble, convenient to check level when tester is working
■ Pressure of pencil lead :500g/1000g/7.5N