Indentation Hardness
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Definition:
The hardness of a material as determined by either the size of an indentation made by an indenting tool under a fixed load, or the load necessary to produce penetration of the indenter to a predetermined depth. The test usually employed for plastics is by means of a durometer such as the Shore instrument, comprising a spring-loaded indentor point projecting through a hole in a presser foot, and a device to indicate the distance this point projects beyond the face of the foot. The scale readings range from 0 (for 0.100'' penetration) to 100 (for zero penetration). The Shore A instrument employs a sharp indentor point with a load of 822 grams. In the Shore D instrument, used for very hard plastics, the point is blunt and the load is 10 pounds. See also KNOOP HARDNESS NUMBER and PFUND HARDNESS NUMBER.
Definition Copyright ©1989 CRC Press LLC. All rights
reserved.
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