KS M 3076. ISO 306,ASTM D 1525
- This tester has a temperature-controlled sump (Oil Bath). There is a flat needle
on the sump, so the degree of penetration is written to the gauge. After placing the
needle that has prescribed load on the specimen, softening point is measured raising
the temperature of 50 degrees per hour. This device measures the temperature(VICAT
Softening Point) when the needle penetrates 1mm from the reference plane of the
- Softening temperature is different from the concept of the melting temperature,
(MFR). it is a temperature when the resin soften without change, and can’t bear the
stress. A higher softening point means that the heat resisting property is good.
Generally, the softening temperature is proportional to density of the resin,
therefore, softening temperature is used as a important measure of comparison to
softening by heat of thermoplastics resins.