Vicat softening point

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What Wikipedia says

Vicat softening temperature 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 mm2 circular or square cross-section.

Excerpt from the Wikipedia article “Vicat softening point”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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