ASTM D 1525

ASTM D 1525 : Standard Test Method for Vicat Softening Temperature of Plastics¹ This test method covers determination of the temperature at wich a specified needle penetration occurs when specimens are subjected to specified controlled test conditions. This test method is not recommended for ethyl cellulose, nonrigid poly (vinyl chloride), poly (vinylidene chloride), or other materials having a wide Vicat softening range. The values stated in SI units are to be regarded as the standard. Note 1 : This test method ans ISO 306 are technically equivalent, with the exception of the allowance for creep, prior to beginning the test, in this test method.