Dictionary of Polymer Terminology

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A durometer is an equipment that is primarily used for measuring the hardness of materials that are made up of materials such as: elastomers; polymers and rubbers. It is also called as “Shore Durometer”. If the durometer scale shows high figures, it indicates that the material has the greater resistance to indentation. Similarly, if the durometer reading is low, it indicates that the material is a soft material and have less resistance.


A durometer is used when the resistance capacity of any plastic, rubber or elastomeric material has to be checked and it is to understand if the material is hard or soft material. The standard test for checking the rubber property and durometer hardness test is ASTM D2240 Standard Test Method. This test consists of 12 types of hardness measurement devices called as Durometers. The types are as follows:

Durometer Type / Scale

Durometer Hardness

Type A


Type B

Above 90 A Below 20 D

Type C

Above 90 B Below 20 D

Type D

Above 90 A

Type DO

Above 90 C Below 20 D

Type M

Above 90 C Below 20 D

Type O

Below 20 DO

Type OO

Below 20 DO

Type OOO

Below 20 DO

Type OOO-S

Below 20 DO

Type CF

ASTM F1957

Type SL

ASTM F1957