What is durometer

The Shore durometer is a device for measuring the hardness of a material, typically of rubbers, polymers & elastomers. Lower numbers indicate less resistance (softer materials) and higher numbers indicate a greater resistance to indentation (harder materials).

The Shore A Hardness Scale measures the hardness of flexible mold rubbers that range in hardness from very soft and flexible to hard with almost no flexibility at all. The Shore D Hardness Scale measures the hardness of hard rubbers, semi-rigid plastics and hard plastics.

 
Material Durometer Scale
Bicycle gel seat 15–30 OO
Chewing gum 20 OO
Sorbothane 30–70 OO
Rubber band 25 A
Door seal 55 A
Automotive tire tread 70 A
Soft wheels of roller skates and skateboard 78 A
Hydraulic O-ring 70–90 A
Hard wheels of roller skates and skateboard 98 A
Ebonite rubber 100 A
Solid truck tires 50 D
Hard hat (typically HDPE) 75 D
Cast urethane plastic 80 D

Updated: 3/12/2019

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