n The indentation hardness determined with a Knoop indenter, and calculated as follows:
Where L = load in kilograms applied to the indenter, 1 = measured length of long diagonal of the indention in millimeters, Cp = indenter constant relating 12 to Ap, and Ap = projected area of indention in square millimeters. (Handbook of physical polymer testing, vol 50. Brown R (ed). Marcel Dekker, New York, 1999; www.astm.org).
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Gooch, J.W. (2011). Knoop Hardness Number, KHN. In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6247-8_6692
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