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Knoop hardness is measured by an absolute value, which is mainly used in processing.
In general, diamond has a Knoop hardness of 7000-8000 kg/mm 2.
The Knoop hardness test is mainly used for metallography and metallographic studies.
It is especially suitable for testing hard and brittle materials and is often used to test materials such as tantalum, glass, synthetic diamond, metal grass and minerals.
It can also be used to determine the effective depth of a hardfacing layer for testing small parts, small areas, thin materials, thin wires, hardness of blade attachments, plating and hardness of dental materials.
There is no special hardness tester for Knoop hardness test. It is usually a shared micro Vickers hardness tester.
It is only necessary to change the pressure head and change the hardness value.
In terms of microhardness testing, United States usually uses Knoop indenters and 100g force, while Europe is accustomed to using Vickers indenters and larger 500g forces.