Vicat softening point or Vicat hardness is the determination of the softening point for materials that have no definite melting point, such as polycarbonate. 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 square cross-section. For the Vicat A test, a load of 9.81 N (1kp) is used. For the Vicat B test, the load is 49.05 N (5kp).
Standards to determine Vicat softening point include:
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