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.
Durometer Chart
| 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 |
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