NF EN ISO 22007-4, T51-227-4 (01/2024)

This document specifies a method for determining the thermal diffusivity of a solid thin plastic disc along the thickness direction by the light flash method. This method is based on measuring the temperature rise on the rear face of a test piece in the form of a thin disk due to a short energy pulse on the front face. The method is applicable to compact homogeneous or composite plastics having an isotropic or orthotropic structure. In general, this includes materials with a thermal diffusivity, a, in the range 1 × 10-7 m2·s-1 < a < 1 × 10-4 m2·s-1. Measurements can be carried out in gaseous and vacuum environments over a temperature range between -100°C and +400°C. NOTE For non-homogeneous specimens, the measured values may depend on the thickness of the specimen.
(Automatic translation from French)