ASTM D1525, ISO 306

VICAT Softening Temperature

Purpose: This test method measures the Vicat softening point of a solid polymer material at predetermined stress/load.

Sample: Test bars

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Basic Description: The bars are placed under the deflection machine a specified load and ramp rate.  The samples are lowered into a silicone bath and tested until the end deflection is occurred.  The temperature is recorded.

Limitations:

  • Method A50 using a force of 10 N and a heating rate of 50° C/h
  • Method B50 using a force of 50 N and a heating rate of 50° C/h
  • Method A120 using a force of 10 N and a heating rate of 120° C/h
  • Method B120 using a force of 50 N and a heating rate of 120° C/h

Source: https://www.astm.org/d1525-17e01.html

Keywords:

  • Deflection temperature under load
  • Heat deflection temperature
  • Vicat softening point

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