Information on the most widely used ASTM standards within the materials testing industry
Model: HVT301 / HVT303 / HVT305
Table type HDT VICAT Testing Machine is mainly used to determine temperature of deflection under load and Vicat softening temperature of thermoplastic plastics, pipes and fittings.
As table type, the frame is low in height and small in the test frame, can put on the desk, save lab space and convenient for user operation.
General introduction
Table type HDT VICAT Testing Machine is mainly used to determine temperature of deflection under load and Vicat softening temperature of thermoplastic plastics, pipes and fittings.
As table type, the frame is low in height and small in the test frame, can put on the desk, save lab space and convenient for user operation.

Main Features
1, Can execute both HDT and Vicat tests on the one machine, only change loading nose for HDT test, and needle for VICAT test.
2, Conforms to ISO 75, ISO 306, ISO 2507 and ASTM D648, ASTM D1525, ASTM D5944, ASTM D5945. GB/T 8802, GB/T 1633, GB/T 1634
3, Three working stations, with all necessary press nose, needle and weights.
4, Use the Digital micrometer to replace the old dial indicator and displacement sensor, more accuracy;
5, Table type;
6, Three kinds display and operation mode for selection; digital economical, 5.7” touching screen and computer controlled.
7, Manual lifting sample racket type;
8, Micro-Printer function to print test report;
9, With CE certificate.
ISO 75 Plastics -- Determination of temperature of deflection under load
ISO 306 Plastics -- Thermoplastic materials -- Determination of Vicat softening temperature (VST)
ISO 2507 Thermoplastics pipes and fittings -- Vicat softening temperature
ASTM D648 Standard Test Method for Deflection Temperature of Plastics Under Flexural Load in the Edgewise Position
ASTM D1525 Standard Test Method for Vicat Softening Temperature of Plastics.
HDT Heat deflection temperature test:
The bars are placed under the deflection measuring device. A load of 0.45 MPa or 1.80 MPa is placed on each specimen. The specimens are then lowered into a silicone oil bath where the temperature is raised at 2° C per minute until they deflect 0.25 mm for ASTM, 0.32 mm for ISO flatwise, and 0.34 mm for ISO edgewise.
VST VICAT softening point test:
A test specimen is placed in the testing apparatus so that the penetrating needle rests on its surface at least 1 mm from the edge. A load of 10N or 50N is applied to the specimen. The specimen is then lowered into an oil bath at 23 degrees C. The bath is raised at a rate of 50° or 120° C per hour until the needle penetrates 1 mm.
Main technical specification
| Model | HVT301/HVT303/HVT305 |
| Structure | Table |
| Sample racket lifting | Manual |
| Control & Display | Microcontroller Digital display/ Touching screen / Computer |
| Printer | Micro-Printer / HP Printer |
| Temperature range | Ambient temperature to 300℃ |
| Heating speed | 120±10℃/h, (12℃±1℃/6min ) 50±5℃/h, (5℃±0.5℃/6min) |
| Temperature resolution | 0.1℃ |
| Deformation resolution | 0.01mm |
| Temperature accuracy | ±0.5℃ |
| Deformation measuring | 0~2mm |
| Load range | 0.73N~49.03N |
| Test stations | 3 sets |
| Vicat Loading capacity | GA=10N±0.2N, GB=50N±1N |
| HDT test | Method A: USE FIBRE STRESS 1.80Mpa Method B: USE FIBRE STRESS 0.45Mpa Method C: USE FIBRE STRESS 8.00Mpa |
| Specimen rack span | 60mm ~ 120mm continuous adjusting |
| Power | 4Kw |
| Electrical supply | 220V, 50HZ/110V, 60HZ |
| Heating medium | methyl silicon oil or transformer oil |
Main Accessories
| Item | Quantity |
| Frame | 1 set |
| Electrical control cabinet | 1 set |
| Sample supporter racket | 3 pcs |
| Weight (2000g,500g,100g,50g) | 3 pcs for each |
| Weight (1000g, 200g) | 6 pcs for each |
| Weight (40g, in one box) | 3 set |
| Vicat needle indenter | 3 pcs |
| HDT pressing head | 3 pcs |
| Displacement sensor | 3 pcs |
| Platinum resistor | 1 pc |
| Electric wire | 1 set |
| Connection wire | 1 set |
| Accessories containing case | 1 pc |
| Computer (for HVT305, 306) | 1 set |
| Professional software (English version) (for HVT305, 306) | 1 set |
| Documents (Manual, packing list, certificate) | |
Standard
ISO 75 Plastics -- Determination of temperature of deflection under load.
ISO 75 specifies a general test method for the determination of the temperature of deflection under load (flexural stress under three-point loading) of plastics. Different types of test specimen and different constant loads are defined to suit different types of material. It is determined for materials such as thermoplastics, hard rubber and duroplastic laminates.
The heat deflection temperature is a measure of a polymer's ability to bear a given load at elevated temperatures. The deflection temperature is also known as the 'deflection temperature under load' (DTUL), 'heat deflection temperature', or 'heat distortion temperature' (HDT). The two common loads used are 0.46 MPa (66 psi) and 1.8 MPa (264 psi), although tests performed at higher loads such as 5.0 MPa (725 psi) or 8.0 MPa (1160 psi) are occasionally encountered. The common ASTM test is ASTM D 648 while the analogous ISO test is ISO 75. The test using a 1.8 MPa load is performed under ISO 75 Method A while the test using a 0.46 MPa load is performed under ISO 75 Method B.
The test geometry used to measure deflection temperature under load in plastics such as in the ASTM D 648 test.
ISO 306 used to determine the Vicat Softening Temperature (VST) of thermoplastic materials. The VST is defined as the temperature at which a thermoplastic material starts to soften rapidly under a specified load and heating rate.
ASTM D1525: Standard Test Method for Vicat Softening Temperature of Plastics
ASTM D1525 test method covers determination of the temperature at which a specified needle penetration occurs when specimens are subjected to specified controlled test conditions. It's equivalent to standard ISO306.
Test Procedure:
A test specimen is placed in the testing apparatus so that the penetrating needle rests on its surface at least 1 mm from the edge. A load of 10N or 50N is applied to the specimen. The specimen is then lowered into an oil bath at 23 degrees C. The bath is raised at a rate of 50° or 120° C per hour until the needle penetrates 1 mm.
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