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VST softening temperature apparatus
HDT VST Heat Distortion Temperature Tester
Heat Deflection Temperature Testing Machine ASTM D648, ISO 75

Heat Distortion Temperature Tester/VST softening temperature apparatus

Model: HVT302 / HVT304 / HVT306

Heat Distortion Temperature Tester/ VST softening temperature apparatus/ Heat Deformation Vicat Softening Point Tester, specially designed for testing the heat deformation temperature and Vicat softening point temperature of non-metallic materials such as plastics, rubber, and nylon. With advantages in technology, performance, and service, it has become the preferred equipment for quality inspection agencies, universities, and enterprise self-inspection.

Floor type motorized lifting and lowering of the test station, eliminating the need for manual adjustment and reducing operational effort; after the test is completed, the system can automatically stop heating, preventing equipment overload or sample damage due to human oversight, while also saving waiting time.

General introduction

Heat Distortion Temperature Tester/ VST softening temperature apparatus/ Heat Deformation Vicat Softening Point Tester, specially designed for testing the heat deformation temperature and Vicat softening point temperature of non-metallic materials such as plastics, rubber, and nylon. With advantages in technology, performance, and service, it has become the preferred equipment for quality inspection agencies, universities, and enterprise self-inspection.

Floor type motorized lifting and lowering of the test station, eliminating the need for manual adjustment and reducing operational effort; after the test is completed, the system can automatically stop heating, preventing equipment overload or sample damage due to human oversight, while also saving waiting time.

Heat Distortion Temperature Tester/VST softening temperature apparatus

Main Features

  • Key feature
  • Standard
  • Test Procedure

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, Floor frame type;

6, Three kinds display and operation mode for selection; digital economical, 5.7” touching screen and computer controlled. 

7, Motorized 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

ModelHVT302/ HVT304/ HVT306
StructureFloor
Sample racket liftingMotorized
Control & DisplayLCD/ Touching screen/ Computer
PrinterMicro printer/ A4 paper printer
Temperature rangeAmbient temperature to 300℃
Heating speed120±10℃/h, (12℃±1℃/6min )
  50±5℃/h,  (5℃±0.5℃/6min)
Temperature resolution0.01℃
Deformation resolution0.001mm
Temperature   accuracy±0.5℃
Deformation   measuring 0~2mm
Load range0.73N~49.03N
Test   stations3 sets
Vicat Loading capacityGA=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 span60mm ~ 120mm continuous adjusting
Power4Kw
Electrical   supply220V, 50HZ/110V, 60HZ
Heating   mediummethyl silicon oil or transformer oil


Main Accessories

ItemQuantity
Frame1 set
Electrical control cabinet1 set
Sample supporter racket3 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 indenter3 pcs
HDT pressing head3 pcs
Displacement sensor3 pcs
Platinum resistor1 pc
Electric wire1 set
Connection wire1 set
Accessories containing case1 pc
Computer (for HVT305, 306)1 set
Professional software (English version) (for HVT305, 306)1 set
Documents (Manual, packing list, certificate)


Standard

ISO 75, ASTM D648 Plastic Temperature of deflection under load

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.

ASTM D648 Test for Heat Deflection Temperature (HDT) of Plastics

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 Plastic Determination of Vicat softening temperature (VST)

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 Test for Vicat Softening Temperature of Plastics

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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Beijing United Test Co., Ltd.