Shore A and Shore D

These test methods are used to determine the hardness of plastics and elastomers.

Shore hardness is a material parameter for elastomers. The Shore hardness apparatus consists of a spring-loaded indenter whose flexible indentation depth is a measure of the material’s Shore hardness; the hardness is measured on a scale from 0 to 100. A high number means a large hardness.

Shore A is specified for softer elastomer measurements using a needle with a blunted point.

Shore D is specified for harder elastomer measurements using a needle that ends with a 30° point angle and is not blunted.