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Cometech QC-657B HDT Heat Deflection Tester (ASTM D648 / ISO 75-1) | Touchscreen, Multi-Station
- Determines Heat Deflection Temperature (HDT) by applying center stress and heating at 2°C/min until specified deflection is reached.
- Conforms to ASTM D648 and ISO 75-1; supports Vicat heat deflection mode by exchanging the specimen holder/fixture.
- Touchscreen interface with built-in calculation: enter specimen dimensions to auto-calculate required weights/load.
- Multi-station testing with independent temperature and displacement display per station; automatic record + cool-down after reaching deflection.
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Overview
The Cometech QC-657B H.D.T. Heat Deflection Tester measures the temperature at which a specimen reaches a defined deflection under a specified flexural stress while the bath temperature increases at 2°C per minute.
The system uses a touch screen with a guided process to shorten setup time and reduce test errors, and it includes a built-in calculation function to determine required weights from entered specimen dimensions.
By changing the specimen holder, the tester can also support Vicat heat deflection (Vicat softening) testing mode.
Technical Specifications
Standards (as stated)
- ASTM D648, ISO 75-1.
- Also listed by Cometech for this platform: ASTM D1525, JIS K7191-1, JIS K7206, ISO 306.
Test method summary
| Heating rate | 2°C per minute. |
|---|---|
| Typical flexural stress | 0.445 MPa or 1.82 MPa at the center (as described for HDT). |
| Deflection trigger | 0.254 mm (ASTM); also described: 0.32 mm (ISO edgewise) and 0.34 mm (ISO flatwise). |
Core specifications (from your spec image)
| Product serial | QC-657B. |
|---|---|
| Temperature range | Room temperature – 300°C. |
| Temperature control | 2°C per minute (as standard heating rate). |
| Weights | Each station: 0.1N×1, 0.2N×2, 0.5N×1, 1N×1, 2N×2, 5N×1, 10N×1. |
| Deflection reading | 0.001 – 3.000 mm. |
| Flexion span | 100 mm, 64 mm (101.6 mm optional). |
| Specimen support surface | R = 3.0 mm; can be adapted for Vicat heat deflection test head (fixture change). |
| Specimen dimensions (examples) |
ASTM: L=5"(127 mm), d=1/2"(12.7 mm), b=1/4"(6.35 mm); ISO edgewise: L=120 mm, d=10 mm, b=4 mm; ISO flatwise: L=80 mm, d=10 mm, b=4 mm; specimen deviation should be ±0.1 mm. |
| Stations | 3 stations (1, 2, 3). |
| Temperature equalization | Circulating flow. |
| Cooling method | Water cooling. |
| Power | Single phase 220VAC, 15A. |
Interface & workflow highlights (from your interface images)
- ASTM/ISO standard switching on-screen, with specimen dimension input for automatic load/weight calculation.
- Built-in standard test conditions and standardized process flow to reduce test error; supports special test condition setting.
- Multi-specimen display shows real-time temperature and displacement, and stops/records when reaching deflection value, then starts cooling.
Documents & downloads
- Official Cometech page:
QC-657B H.D.T. Heat Deflection Tester (Cometech)