GB/T 5169.21-2017

This standard specifies the ball pressure test method for evaluating the resistance of non-metallic materials used in electric and electronic products to deformation or softening under abnormal heat conditions. It is applied during the design and quality verification of enclosures, insulating parts, and support structures in household appliances, industrial equipment, and electronic devices to ensure they maintain mechanical integrity and prevent fire hazards when exposed to elevated temperatures. The test is particularly relevant for components that may be subjected to thermal stress during operation or fault conditions.