Information on the most widely used ASTM standards within the materials testing industry
ASTM D2137: Standard Test Methods for Rubber Property—Brittleness Point of Flexible Polymers and Coated Fabrics
ISO 812: Rubber, vulcanized or thermoplastic — Determination of low-temperature brittleness
Summary
ASTM D2137 test method detailed in this standard is used to evaluate the brittleness of rubber materials, or rubber coated fabrics, when exposed to low-temperature flex with an impact under specified conditions of striker speed. ASTM D2137 tests performed will be used to determine the lowest temperature at which rubber compounds will not show fractures or coating cracks when exposed to specified impact conditions.
Test Details
When environmental conditions during testing are comparable to the conditions during a material's performance cycle, the data obtained from the tests can be used to predict how the material will behave. However, the results do not necessarily indicate the lowest temperature that the material can be used.

Related Standard
ISO 812:2017 specifies a method for determining the lowest temperature at which rubber materials do not exhibit brittle failure or the temperature at which half of the test pieces used in a test fail when impacted under specified conditions.
The temperatures thus determined do not necessarily relate to the lowest temperature at which the material can be used since the brittleness will be affected by the conditions of test and especially by the rate of impact. Data obtained by this method are, therefore, intended to be used to predict the behaviour of rubbers at low temperatures only in applications in which the conditions of deformation are similar to those specified in the test.
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