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VICAT Softening Point Apparatus / HDT – Heat deflection / distortion test
For determination of the Vicat softening temperature and the deformability temperature.
Thermoplastics do not have a certain melting point that defines the transit from solid to liquid with accuracy. It is rather a gradual softening with the increase in temperature. For this reason, the Vicat softening temperature was introduced as a substitute value for the melting point in the measurement sector. This value describes the temperature at which a circular indentor of 1 mm² in section, under a standardised load of 10 N or 50 N, penetrates exactly 1 mm into the specimen. The Vicat softening temperature is standardised in ISO 306 and ASTM D 1525.
A standard sized test specimen is subjected to a bending stress, whilst the temperature is raised at a uniform rate. The temperature at which the specified deflection occurs is measured and recorded. Testing is carried out in accordance with the ISO 75 (parts 1, 2 and 3) and ASTM D648 Test Standards.
Since this result given by the temperature depends on the load selected, the geometry of the specimen, the heating speed and the flexture chosen, the bending temperature under load represents an applicable value for comparing different materials with each other. The measurement of the deformability of plastics at temperature may be overlapped by internal material stresses.
– VIACT / HDT equipment of 3 stations
– Set of 16 weights for each test station
– 1 LVDT sensor linear displacement measurement for each station
– HDT / VICAT Test Software
– 1 “All in One” desktop PC of 20 “+ OS Windows
ASTM D1525 , ASTM D648 , DIN 306 , DIN 75-1 , DIN 75-2 , EN 306 , EN 727 , EN 75-1 , EN 75-2 , ISO 2507 , ISO 306 , ISO 75-1 , ISO 75-2 , UNE 306 , UNE 727 , UNE 75-1 , UNE 75-2