Shore Hardness Scale
The Shore hardness scale is one way in which the hardness of a material is represented numerically. Hardness is the resistance of a material to indentation and is measured by the permanent depth of an indentation that has occurred. The Shore hardness scale includes a Shore A scale used for soft polymers and elastomers as well as a Shore D scale used for hard polymers. A Shore hardness scale value ranges between a minimum of 0 and a maximum of 100, and is determined by the amount of penetration from a needle-shaped indenter tip.