Model : HDT/VSP-500
Heat Deformation Tester is an advanced laboratory device engineered to evaluate how materials perform under high temperatures and applied loads. By determining key thermal properties such as HDT and Vicat softening temperature, this tester allows manufacturers, researchers, and quality control teams to understand the exact point at which a material begins to soften or deform.
A Heat Deformation Tester is a precision laboratory instrument used to measure how materials behave when exposed to elevated temperatures and pressure. It determines the Heat Deflection Temperature (HDT) and Vicat Softening Point (VSP)—two critical indicators of thermal performance. By applying a controlled load and gradually increasing heat, the tester reveals the temperature at which a material begins to soften, deform, or lose structural integrity. This makes it an essential tool for evaluating the reliability and durability of plastics, polymers, composites, and other heat-sensitive materials.
A Heat Deformation Tester operates by placing the specimen under a specific load and immersing it in a controlled heating medium, usually oil or silicone. As the temperature rises at a constant rate, the machine monitors the material’s deflection or softening point with high accuracy. The test ends when the specimen reaches a predefined deformation value or when the Vicat needle penetrates to the set depth.
The results provide a precise measurement of the temperature at which the material can no longer maintain its shape under stress crucial data for quality control, product design, and thermal resistance evaluation.
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Model: HDT/VSP-500
No. of Test Stations: 2 (HDT & VSP)
Temperature Range:
Water medium: Ambient to 90°C
Silicone oil medium: Ambient to 250°C
Rate of Heating:
50 ± 5°C/hr
120 ± 10°C/hr
Temperature Controller: Digital Microprocessor PID-based with auto-tuning
Dial Gauge Range: Up to 10 mm
Least Count: 0.001 mm
Test Weights:
VSP: 10 N and 50 N
HDT: 0.455 MPa and 1.82 MPa
Indenter Tip Diameter:
HDT: 13 mm (approx.)
VSP: 1 mm (flat-ended needle)
Liquid Medium: Water (90°C) / Silicone Oil (260°C)
Heater: 1 kW × 2
Power Supply: 220V, 50Hz, Single Phase
Material Construction:
Outer Body: Mild Steel
Inner Chamber: Stainless Steel
Finish: Powder-coated Havel Gray & Blue, chrome/zinc-plated for corrosion resistance
Motor Type: Stirrer motor (1/70 HP, 1350 rpm) for uniform temperature distribution
Drain Valve: Provided
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