Softening point
Encyclopedia
The softening point is the temperature at which a material softens beyond some arbitrary softness. It can be determined, for example, by the Vicat
method (ASTM-D1525 or ISO 306), Heat Deflection Test (ASTM-D648) or a ring and ball method (ASTM E28-67).
Vicat softening point
Vicat softening point or Vicat hardness is the determination of the softening point for materials that have no definite melting point, such as plastics. It is taken as the temperature at which the specimen is penetrated to a depth of 1 mm by a flat-ended needle with a 1 square mm circular or...
method (ASTM-D1525 or ISO 306), Heat Deflection Test (ASTM-D648) or a ring and ball method (ASTM E28-67).