The heat resistance of non-metallic materials and insulation materials directly affects the safety of electrical products If the quality of non-metallic materials or insulation materials in electrical products does not meet the requirements, deformation, combustion or leakage may occur in the event of product failure or overload, leading to accidents Therefore, non-metallic materials and insulation materials in electrical products must have sufficient heat resistance, and ordinary lighting fixtures are no exception

Ball pressure test is a test to test the heat resistance of structural materials of electric tools by pressing a certain quality ball pressure tester into the surface of non-metallic or non ceramic materials at a certain temperature (125 ± 2 ° C) and for a certain period of time according to the standard conditions.

Place the specimen in a horizontal position and apply a pressure of 20N to a 5mm diameter steel ball on the surface of the specimen. This test should be conducted inside a heating chamber at a temperature of 75 ° C ± 2 ° C. The diameter of the indentation should be measured after the steel ball has been applied for 1 hour. If the indentation diameter is greater than 2mm, the test fails.