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

Helpful Links

Are you looking for casters?

About Monroe


Over 60 years of manufacturing experience to best serve our customers



Monroe provides custom manufacturing solutions to clients throughout the world


Value Adds

Our knowledge, customer service & processes are structured to reduce delivery times, improve quality & cut costs



Monroe is committed to customer satisfaction, we strive for continuous improvement in our products and our people.


The information contained in this website is for general information purposes only. The information is provided by Monroe Engineering, LLC, Inc. (Monroe) and while we endeavour to keep the information up-to-date and correct, we make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with respect to the website or the information, products, services, or related graphics contained on the website for any purpose. Any reliance you place on such information is therefore strictly at your own risk. All users should evaluate product suitability for each intended application of that product under actual use conditions. In no event will we be liable for any loss or damage including without limitation, indirect or consequential loss or damage, or any loss or damage whatsoever arising from this information.