This standard specifies a method for determining the thickness of vacuum metal platings on the surface of insulating soft substrates using the resistance method. Calculate the square resistance or thickness of platings by measuring the resistance value of metal platings and applying Ohm's law. The standard applies to vacuum metal platings on insulating soft substrates and describes the preparation of the specimen, the requirements of the measurement device, and the test steps. The test instrument shall have a resistance measurement error of not more than +/- 1%, and the specimen shall be flat and clean. The test report shall include information such as platings thickness, square resistance, test environment, etc., to ensure that the platings mass meets the standard requirements.