There are various Durometer scales in use today. They include: A B C D DO O OO OOO T M
Various scales are used to measure hardness ranging from sponge to steel. For example, the Shore 'A' scale ranges from 0 to 100 units and usually refers to rubber or synthetics. A20 would be an extremely soft silicone rubber while A85 would be a hard rubber skateboard wheel. The Rockwell B scale measures in the range of soft steels. Rockwell C measures harder steels.
Durometers typically work by measuring the resistance, in newtons, of a pin as it penetrates a given material. This article is about the SI unit of force. ...
Durometers are described in the American Society for Testing and Material specification ASTM D2240, which is the recognized specification for the instrument and test procedures.
All durometers have a springloaded indentor which applies an indentation load to the specimen, thus sensing the "hardness", which can be related to other material characteristics.
Because Durometers measure hardness by relating the penetration of an indentor into a specimen, and because the indentor travel may reach.100", it follows that a specimen must be of sufficent thickness to ensure a proper, sensitive test.
Durometers are used to measure the indentation hardness of a large range of materials.
The most popular durometers are types A and D. Type A is often used for rubber and soft plastics while type D is used for harder materials such as bowling balls and thermo plastics.
Durometer Hardness test is non-destructive and does not require specimen preparation, which makes it an ideal method for checking materials under any condition with accuracy and reliability.
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