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ISO 9385:1990 Glass and glass-ceramics - Knoop hardness test
standard by International Organization for Standardization, 05/01/1990
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This international Standard describes the method of test for determining the Knoop hardness number of glass and glass-ceramics.
The Knoop hardness number characterizes the behaviour of glass and glass-ceramics concerning a permanent change of the surface after indentation with a solid material.