GB/T 7196-2012 specifies the liquid extraction test method for the determination of ionic impurities in electrical insulating materials. The standard specifies the extraction process, reagent selection and detection steps, which can effectively determine the content of ionic impurities in electrical insulating materials. Through this standard method, the purity and mass of materials can be accurately evaluated, providing a reliable basis for the production, quality control and Product Research & Development of electrical insulating materials, and ensuring the safe and stable operation of electrical equipment. It has key guiding significance in the field of electrical insulation.