Thermal Conductivity Testing Process
There are a number of test methods for measuring thermal conductivity of a material, including solids, liquids, powders, and pastes. Two common methods are transient plane source (TPS) and transient line source (TLS). Both methods utilize a heated sensor, usually shaped like a needle or a disc, to apply controlled heat to a sample. Technicians then use additional sensors and instruments to measure how quickly heat moves through the material. The interval at which measurements are taken may differ depending on the method, the application, and the material under test.
Common industry standards that include thermal conductivity testing are ASTM D7984 and ASTM D5930.
Test methods for assessing thermal conductivity include:
ASTM D7984—Standard Test Method for Measurement of Thermal Effusivity of Fabrics Using a Modified Transient Plane Source (MTPS) Instrument
ASTM D7984 is used to assess the thermal conductivity and heat transfer rate of fabrics. This is especially important when designing clothing for specific climates and environments. For example, some fabrics are designed to make the wearer feel “cool,” whereas others are designed to amplify feelings of warmth. Thermal conductivity testing data can help designers understand the thermal properties of different fabrics, so they can choose the right one for a project.
ASTM D7984 is suitable for knitted, woven, and non-woven fabrics.
ASTM D5930—Standard Test Method for Thermal Conductivity of Plastics by Means of a Transient Line-Source Technique
ASTM D5930 is most often used to assess the thermal conductivity of a variety of materials, such as plastics, thermoplastics, thermosets, and rubbers. ASTM D5930 is ideal for fast measurements of plastic and rubber thermal conductivity, making it especially valuable for testing the thermal properties of more fragile materials before heat exposure leads to degradation. This method is also effective for understanding changes to material properties, such as chemical reactions and aging. The method described in ASTM D5930 produces ample data, which is valuable for developing a clear and comprehensive picture of a materials’ thermal conductivity.
Material Testing from ACE
ACE Laboratories is fully equipped to conduct thermal conductivity and other thermal and material properties testing on an incredibly wide range of materials. Our highly knowledgeable team has years of experience in both laboratory and industry settings, offering a valuable perspective on thermal conductivity, resistance, and other properties and their implications for a given product or application. We can design a custom testing program based on a specific product development goal or business decision or conduct industry standard protocols, depending on your needs. Plus, ACE offers on-site sample preparation services for both standard and unusual materials and can excise precise, test-ready samples from finished products as well as raw materials.
In addition to our material properties testing capabilities, ACE offers comprehensive solar reflectance and emittance testing for construction materials, such as roofing and coatings.