Knoop Indentation Hardness of Glass ASTM C730

Knoop Indentation Hardness of Glass ASTM C730

ASTM C730 is a microhardness test described to determine the Knoop indentation hardness of glass and the authentication of Knoop indentation hardness testing machines that make use of standard glasses..


    ASTM C730 has been made to compare Knoop indentation hardness with tensile strength, grinding speeds, and other hardness scales. Knoop hardness is one of many properties that is used for the characterization of glasses. Such kinds of conversions are partial in scope and should be used with caution.

    Test Procedure:

    In ASTM C730, the Knoop Indentation Hardness of Glass is an imprint of undeformed indentation. An Indentation hardness test is done by using a calibrated machine to force a rhombic based, pointed, pyramidal diamond indenter having specific face angles, under a fixed load, into the surface of the material under test, and then the measurement of long diagonal of the resulting impression after removing the load. 

    Specimen Size : 

    The specimen should remain intact with an indenter between the 20s and 30s. The rate of indenter motion with specimen shall be 0.20 ± 0.05 mm/min and the test load 100gf.


    The  Knoop hardness HK  is calculated by using the following equation



    L = length of indentation along its long axis

    Cp = correction factor related to the shape of the indenter, 

    P = load


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