There are a number of test methods for measuring thermal conductivity of a material, including solids, liquids, powers, 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.
Test methods for assessing thermal conductivity include: