ASTM Certifies First Test Method For Dynamic Thermal Performance In Textiles
JUNE 01, 2004 -- The American Society For Testing and Materials (ASTM) approved a new standard test procedure to measure the amount of latent energy in textile materials. Based on years of research and testing textiles containing "phase change materials" (PCMs) by Outlast Technologies and Dr. Hittle of Colorado State University, the first "Test Method for Steady State and Dynamic Thermal Performance in Textile Materials" (ASTM D7024) was established by the ASTM.
"Phase-change technology in temperature regulating textiles with increased latent energy represents an entirely new approach to providing increased comfort and performance. Standard testing procedures used for determining the insulating value of traditional fabrics do not measure the stored energy in these new, innovative Smart fabrics," explained Mark Hartmann, technical director at Outlast.
Therefore, a new test method and apparatus was required as ASTM D1518 "Standard Test Method for Thermal Transmittance of Textile Materials" only determined the R-value (or CLO value as used in the garment industry) in a steady state. Hartmann continued, "This new test method measures dynamic temperature changes and differentiates and quantifies the temperature buffering properties of a material in a dynamic environment. It measures the effects of changing temperature and a fabric's ability to absorb, store and release energy. This test provides the measurement to separate PCM technology from unsubstantiated claims of temperature regulation through moisture management, wicking or straight thermal insulation properties of a fabric."