Testing Parameters / Thermal Properties
Heat deflection temperature (HDT) testing — deflection temperature under load. As an independent third-party lab, LEISA tests this parameter to international and national standard methods and issues traceable, arbitration-grade data.
Heat deflection temperature (HDT) is not a stand-alone number detached from service conditions. Reliable testing first confirms product type, material system, dimensions, sampling location, specimen orientation, conditioning, and the intended environment before the applicable method and acceptance clauses are selected. The laboratory records sample and batch identity, equipment calibration status, environmental conditions, loading or measurement procedure, raw data, calculations, anomalies, deviations, and measurement uncertainty where relevant. The final report clearly separates the measured result from any conformity decision made against a specified criterion. This information lets a buyer accept a production batch, helps a manufacturer trace process variation, and allows an engineer to decide whether the data are suitable for material selection, structural calculations, or service-life assessment.