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ISO 458-1:1985
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ISO 458-1:1985 Plastics - Determination of stiffness in torsion of flexible materials - Part 1 : General method
standard by International Organization for Standardization, 03/01/1985
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Full Description
Specification of a general method for the determination of the stiffness in torsion at various temperatures, particularly below 0 C. An observation of torque and angle of deflection is made after an arbitrarily fixed time of load application, using the specified testing apparatus. This procedure is employed at a single temperature or at selected temperature intervals over a range specified for the material to be tested. The stiffness in torsion is expressed as the apparent torsional modulus of elasticity for each temperatur.