GB/T 30808-2014

This standard specifies a test method for measuring the retention rate of tensile strength perpendicular to the faces of thermal insulation products after exposure to hygrothermal conditions. It is applied in the construction industry to evaluate the durability and long-term performance of insulation materials, such as mineral wool or foam boards, when subjected to combined heat and moisture in building envelopes. The test is critical for quality control and product certification to ensure insulation maintains its mechanical integrity in real-world environmental conditions.