Thermal Conductivity Tester (Heat Flow Method)

Thermal Conductivity Tester (Heat Flow Method) is a high-precision instrument designed for measuring the thermal resistance, thermal conductivity, and interface contact thermal resistance of thin heat conductors, solid electrical insulation materials, thermal grease, resins, rubber, beryllium oxide ceramics, and aluminum oxide ceramics. The device can test solid sheet materials directly, and with the use of a sample frame, it can also measure powdered and paste materials. The tester is designed and manufactured in full compliance with ASTM D5470-2017 standards and has benefited from over 20 years of production experience, ensuring reliability, mature performance, and high testing accuracy. The system features servo-controlled precise automatic pressing, automatic thickness measurement, 6-point temperature gradient detection, and computer-controlled fully automatic operation. The built-in thermal guard around the test rod reduces environmental temperature influence, allowing accurate measurements of thermal conductivity, thermal resistance, and interface contact thermal resistance under varying pressures and temperatures.

The instrument is widely used in universities, research institutions, quality inspection laboratories, and industrial production plants for material thermal property analysis.

Application

This tester is suitable for testing:

Thin heat conductors

Solid electrical insulation materials

Thermal greases, resins, and rubber

Beryllium oxide ceramics and aluminum oxide ceramics

Aluminum substrates, composite boards, and thermal pads

Typical applications include:

Academic research: Measurement of material thermal properties

Industrial quality control: Verifying thermal performance of production materials

R&D labs: Testing new thermal interface materials (TIMs)

Production sites: Monitoring and screening high-thermal-conductivity materials

Standards

The instrument complies with:

MIL-I-49456A – Insulating Sheet Material, Thermally Conductive Resin, Glass-Fiber Reinforced Thermal Materials

GB/T 5598-2015 – Method for Determining Thermal Conductivity of Beryllium Oxide Ceramics

GB/T 29313-2017 – Test Methods for Thermal Conductivity of Electrical Insulation Materials

ASTM D5470-2017 – Test Method for Thermal Transmission Properties of Thin Thermally Conductive Solid Electrical Insulation Materials

Parameters

Features

High-precision measurement of thermal conductivity, thermal resistance, and interface contact thermal resistance

Automatic servo-controlled pressing and thickness measurement

6-point temperature gradient detection enhances measurement accuracy

Built-in thermal guard reduces environmental temperature influence

Suitable for both solid sheets and powder/paste materials

Fully computer-controlled with data recording and printing

Compatible with high-conductivity materials measurement using optional modules

Accessories

Main instrument

Analysis software (Chinese & English versions)

HX-1008 precision low-temperature constant temperature water bath (temperature control ±0.01 °C)

Calibration reference samples (2 pieces)

Sample accessories set (thermal grease, paste, powder test boxes, stamping molds for sheet samples)

Test Procedures

Prepare the sample according to specified size and shape. Solid sheets or stacked layers can be used; powder/paste requires a sample frame.

Place the sample between the hot and cold plates.

Set desired hot and cold plate temperatures via software.

Apply pressure using the servo-controlled mechanism.

Start the measurement; the system automatically records temperature gradients and thickness.

Wait for measurement completion; the software calculates thermal conductivity, thermal resistance, and contact thermal resistance.

Save and print results as required.

Maintenance Information

Keep hot and cold plates clean and free of residue.

Calibrate regularly using reference samples.

Inspect heat guards and pressure mechanisms for proper operation.

Maintain stable laboratory temperature to ensure measurement consistency.

Ensure proper water bath operation for cold plate stability.

FAQ

1. What materials can tester measure?

This tester can measure thin heat conductors, solid electrical insulation materials, thermal greases, resins, rubber, beryllium oxide ceramics, aluminum oxide ceramics, aluminum substrates, and composite boards. It can also measure powders and pastes with the use of a sample frame.

2. How accurate is the measurement?

The thermal conductivity and thermal resistance measurements have an accuracy of ≤3%, while contact thermal resistance measurements have an accuracy of ≤5%. The use of 6-point temperature gradient detection and thermal guards ensures precise results even under varying pressures and environmental conditions.

3. Can this tester test high-conductivity materials?

Yes. This tester supports a high-conductivity mode ranging from 5–500 W/m·K. The computer software automatically switches between standard and high-conductivity modes. Optional modules can further enhance measurement capabilities for high-conductivity materials.

4. What types of samples can be used?

Solid sheets, stacked layers, powdered, and paste materials can all be tested. Sample frames are required for powders or pastes. Standard sample sizes are Φ30 mm or 20×20 mm, but custom sizes are available. Thickness ranges from 0.001–50 mm.