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Vicat Softening Temperature - ASTM D1525

The temperature at which a 1mm2 flat-ended needle will penetrate 1mm into a material under a specified load and heating rate. The vicat softening temperature can be used to compare the heat-softening characteristics of different materials.

Two different heating rates and two different loads may be used for testing.

Heating Rate A: 50°C/hr
Heating Rate B: 120°C/hr

Loading 1: 10 N (1 kg)
Loading 2: 50 N (5 kg)

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