Softening point
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Description
The temperature at which a solid, thermoplastic material experiences plastic flow. The ASTM softening point test is done by raising the temperature of the specimen at a constant rate of 50 deg C per hour while the flat end of a needle is being pressed into the specimen with a load of 1000 grams. The softening point occurs when the needle can penetrate the material 1 millimeter.
Synonyms and Related Terms
point de ramolissement (Fr.); Fließpunkt (Deut.)