Knoop hardness test

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A method of measuring the hardness of a material using a microscope (developed by F. Knoop in 1939), in which a pyramidal diamond point is used to make an indentation into the test material. It produces a much smaller indentation than the Vickers hardness test because of the lower indentation pressure. The Knoop Hardness Number (HK, KHN) is a measure of the load divided by the size of the indentation.

Subjects: Dentistry.

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