Heat deflection temperature
= Heat deflection temperature
{wiki=Heat_deflection_temperature}
Heat Deflection Temperature (HDT) is a critical thermal property of materials, particularly plastics and polymers. It refers to the temperature at which a material deforms under a specified load when heated. HDT is typically measured under a standard load (such as 1.82 MPa or 264 psi) and provides an indication of a material's ability to withstand elevated temperatures without losing its structural integrity.