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Hardness is the resistance of a coating to a mechanical force, such as pressure, rubbing or scratching. In practice, different testing methods are used:

Pendulum Hardness
- In accordance with methods described by K├Ânig and Persoz

Indentation Hardness
- Buchholz Indentation Testers

Scratch Hardness
- Hardness Meter Dur-O-Test
- Pencil Hardness

BYK-Gardner offers instrumentation needed to perform various hardness tests.

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