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Thermal Resources

Leading provider of Thermal Conductivity Testing and Thermal Conductivity Instruments as well as Thermal Resistivity, Specific Heat Capacity and Thermal Diffusivity

Testing Services

Featured Product

TLS-100 - ASTM D5334
Range: 0.1 - 5 W/mK

New Options

Data analysis software
Automated temp control(-15 to 100°C)


TPS - Transient Plane Source
Solids, Liquids, Pastes & Powders
Range: 0.001 to 1800 W/mK
Standard: ISO 22007-2
TLS - Transient Line Source
Soils & Rock, Lab & Field
Range: 0.03 to 10 W/mK
Standard: ASTM D5334
THW - Transient Hot Wire
Liquids & Pastes
Range: 0.01 to 2 W/mK
Standard: ASTM D7896-14
Low cost - Portable - Handheld
Thermal conductivity
Thermal resistivity
HFM - Heat Flow Meter
Foams, Textiles & Solids
Range: 0.005 to 0.5 W/mK
Standard: ASTM C518
DIL - Dilatometer
Temp range: RT to 1600C
Standard: ASTM 228
Testing Services
Liquids, Solids, Pastes & Powders
Thermal Conductivity, Thermal Diffusivity
Specific Heat, Thermal Resistivity

TPS - Transient Plane Source

Hot Disk TPS 2500 S

The Hot Disk Transient Plane Source TPS 2500 S Thermal Conductivity Instrument is designed for analyzing thermal conductivity, thermal diffusivity and specific heat of solids, liquids, paste and powders, including various types of geometry and dimensions. The TPS 2500 S and TPS 1500 Thermal Conductivity Systems are the only Transient Plane Source (TPS) method to meet the standard (ISO/DIS 22007-2.2).

  • Homogeneous and heterogeneous
  • Isotropic and anisotropic
  • Solids, liquids, pastes and powders
  • No contact agent required
  • Direct measurement, no complex calibration required
  • Two-sided and single-sided sensors

TLS-100 Portable Thermal Conductivity Meter

The TLS 100 Portable Thermal Conductivity Meter is a portable instrument for the measurement of thermal conductivity and thermal resistivity in accordance with ASTM D5334 - Standard Test Method for Determination of Thermal Conductivity of Soil and Soft Rock by Thermal Needle Probe Procedure.

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TLS-300 Pro Thermal Conductivity Meter

The TLS-300 Pro Thermal Conductivity Meter is an advanced computer controlled in-field or lab meter capable of testing soils and rocks. The TLS-300 follows ASTM D5334 and IEEE Standard 442-1981. The TLS-300 uses two different probe types: needle probe (100 and 300 mm), which is fully inserted into the sample and single-sided probes which are placed on surface of sample.

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Testing Services

ThermTest maintains a full-service thermophysical measurements laboratory servicing industrial, academic, environmental, government labs and commercial clients in North and South America as well as international markets.

ThermTest continues to upgrade laboratory instrumentation to meet the testing needs of our clients. We are especially proud to be able to offer the sale of multiple instruments and methods for measuring thermal conductivity, which is dependent on your sample type, testing temperature range, and sample dimensions.

Measured Properties:
  • Thermal Conductivity - TPS (ISO/DIS 22007-2.2), TLS (ASTM D5334), THW, TWA, HFM (ASTM C518), GHP (ASTM C177), PPMS, LFA (ASTM 1461)
  • Thermal Diffusivity- TPS (ISO/DIS 22007-2.2), THW (ASTM D2717), LFA (ASTM 1461)
  • Specific Heat Capacity - SHA, TPS (ISO/DIS 22007-2.2), DSC (ASTM E1269)
  • Thermal Resistivity - TLS (D5334)
  • Thermal Effusivity - TPS (ISO/DIS 22007-2.2), THW
  • Thermal Resistance - GHP (ASTM C177), HFM (ASTM C518)
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THW - Transient Hot Wire

The Transient Hot Wire (THW) Liquid Thermal Conductivity System is an advanced PC controlled instrument for testing the thermal conductivity, thermal diffusivity and specific heat of liquids and pastes. The THW uses an in-stationary approach and rapid test times of 800 ms to limit the effects of convection. This allows testing of a wide range of viscosities (0.1 to 10000 mPas). Combined with ability to pressurize (0 to 35 bars) and temperature (up to 400°C), the THW is a very powerful thermal property measurement instrument The THW meets ASTM D-7896-14.

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ThermTest Portable

We have expanded to offer a portable series of thermal conductivity meters and thermal resistivity meters, where the emphasis is on accuracy, portability, simplicity and low cost.

All Thermtest Portable meters have common features of:
  • Single button to results operation
  • Very small learning curve to produce accurate results
  • Savable / exportable results
  • Rugged carrying case
  • Field operation ready
  • Expandability

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HFM - Heat Flow Meter

The Heat Flow Meter Apparatus is a measuring instrument for determining steady-state heat transfer properties, thermal conductivity and thermal resistance of flat slab specimens in accordance to EN 12667, ISO 8301 and ASTM C518 standards. It is designed for use in industrial test laboratories for quality control of thermal insulation materials of low and intermediate thermal conductivity, such as polystyrene, cork, wood wool, etc.

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DIL - Dilatometer

Thermtest dilatometers are designed to measure the thermal expansion of solids, such as ceramics, glasses, metals, carbon composites and cements as a function of temperature. The dilatometer records reversible and irreversible changes in length (expansion and shrinkage) during heating and cooling. Samples are measured for determining firing ranges and firing schedules, measuring thermal expansion ranges for glaze fits, and measuring thermal expansion ranges for R&D, QC or product certification. Our standard dilatometers are used for ASTM E-228 procedures to measure the Coefficient of Thermal Expansion (CTE) as well as softening point, glass transition temperature, curie point, crystalline transformation, phase transition, shrinkage, warping, bloating, sintering rate, isothermal creep and stress relaxation.

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ThermTest Inc.

Thermtest is a leading provider of Thermal Conductivity Equipment and Thermal Conductivity Measurement services as well as Thermal Resistivity, Specific Heat and Thermal Diffusivity testing services.  

Our advanced thermophysical laboratory features a variety of Thermal Conductivity methods, to serve our thermal conductivity testing and instrumentation clients. Covering a wide range of temperatures and dimensions for solids, liquids, pastes and powders.  

Thermtest's principle focus is on Thermal Conductivity Measurement Services, Thermal Conductivity equipment and multiple Thermal Conductivity instrument models.

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