GB/T 9979-2005

This standard provides the testing guidelines for determining the mechanical properties of fiber-reinforced plastics under extreme temperature conditions, specifically at elevated and reduced temperatures. It is applied in material qualification and quality control within the aerospace, automotive, and construction industries, where such composites must perform reliably in thermal environments ranging from cryogenic to high heat. The standard ensures consistent test methods for properties like tensile, flexural, and compressive strength across different temperature chambers and testing equipment.