GB/T 8432-1987

This standard specifies a humidity control reference material used to calibrate and verify the humidity conditions within colour fastness to light testing instruments. It is applied in textile laboratories to ensure that the relative humidity during xenon-arc or carbon-arc light exposure tests remains consistent, directly affecting the accuracy of colour fastness assessments for dyed fabrics. The standard is critical for quality control in the textile industry, particularly for manufacturers and testing facilities evaluating the lightfastness of apparel, upholstery, and other dyed textile products.