Direct Answer: The DEK-TRON Heat Deflection Tester (HDT) measures the temperature at which thermoplastic materials deform under a specified load, helping evaluate performance in heat-exposed environments.

What is the Heat Deflection Tester?

The DEK-TRON Heat Deflection Tester, also known as a DTUL Tester or VICAT Tester, determines the temperature at which a polymer sample deforms when subjected to a defined mechanical load. This test helps identify thermal limits, stiffness characteristics, and suitability of materials for high-temperature applications.

How does it work?

Test specimens are submerged in a controlled liquid bath or heated chamber. A constant load is applied to each sample while the temperature is uniformly increased. The DEK-TRON HDT system automatically detects the temperature at which a specified deflection occurs, following the requirements of the applicable ASTM and ISO methods.

Key features

• Precision temperature-control system ensuring accurate deflection readings
• Available with single or multiple test stations
• Conforms to ASTM D648, ISO 75, and related standards
• Durable, corrosion-resistant construction for long-term laboratory use
• Designed and assembled by DEK-TRON instrument makers

Applications

Used in research, development, and quality-control laboratories to evaluate the heat-deflection characteristics of thermoplastics, composites, and engineering polymers under mechanical stress.

FAQs

What does HDT stand for?
Heat Deflection Temperature — the temperature at which a material deforms under load.

Is the HDT also called a DTUL Tester?
Yes. HDT and DTUL are interchangeable terms referring to the same thermal-deflection test.

What is the VICAT Tester?
A related test instrument that measures the softening point of plastics; the DEK-TRON HDT system can perform both VICAT and DTUL tests with precision.