Pencil Hardness Tester (SH720N)
The Pencil Hardness Tester offers a traditional method to define the scratch hardness of coating systems by the use of pencils of a known hardness. The test can be applied to clear, pigmented organic coating films such as paints, lacquers, varnishes.
Principle of operation
A pencil lead is prepared to form a cylindrical shape, the sharp edge of which interfaces with the coating product at an angle of 45 degree. The Pencil is pushed across the coating under a defined load, subject to the hardness of the pencil used, damage to the coating will be revealed, ranging from a fine scratch to deep gouging through the coating material. The test is repeated using lower grades of pencil until a grade is found that will not damage the coating, either scratch or gouge. Results can either be viewed with the naked eye or by magnification by microscope. (not included with the Pencil Tester)
A rating can be defined for pass/fail criteria whereby a pencil grade is selected that does not deface the surface to a grade that will.
- Pencil Tester Block dimensions: 105 x 50 x 50mm
- Applied load 750 grams
- Set of 20 pencils (9B to 9H)
ASTM: D 3363-05
BS EN: 13523-4
Pencil Hardness Tester
Block set of 20 pencils (9B to 9H)
Abrasive paper (400 grit)
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