The HDT/Vicat Standard instruments have been designed for use in received goods control, product monitoring, as well as for eduction and training purposes. Various instruments with up to 6 testing stations are available. Set-up of the test sequence and test data representation are performed comfortably with connected PC (Option).
The applicational range comprises following tests:
- Determination of Heat Deflection Temperature (HDT) on thermoplastics, hard rubber, as well as fiber reinforced and filled hardenable plastics, according to ISO 75 Parts 1 to 3 and ASTM D 648 Method B
- Determination of Vicat Softening Temperature (VST) on thermoplastics, according to ISO 306 and ASTM D 1525
- Determination of creep test characteristics under deflection loading
Test sequence
As soon as the immersion liquid has reached the starting temperature, the specimens are placed in the testing stations and manually lowered into the bath. The next step is to manually place the test weight, called for in the Standard, onto the testing station and start the menu guided test sequence on the PC.
After pre-tempering while under load, the travel signals are set to zero by the program, and the heating of the immersion liquid is started with the pre-set heating rate. As soon as the required flexure, edge fiber extension or penetration is achieved at all stations, the heating is switched off and the test is ended.
The cooling of the immersion liquid is started automatically by the program via magnetic valve, or it can be started manually. Then the specimens can be taken out of the bath.
Functions, elements and interfaces
- Built-in microprocessor-controlled electronics for temperature control and test data acquisition
- Easily readable test data display
- Safety thermostat
- Electronic bath level monitoring
- Test control and data acquisition via PC with testXpert® II
- Integrated compensation of the thermal expansion of the testing stations with PC operation
- Manual immersion of the testing stations
- Manual placing of the test weights
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