GB/T 7755.1 - 2018 uses differential pressure method to determine the vapor transmission rate of vulcanized rubber or thermal plasticity rubber. It details the preparation requirements of the sample to ensure that the material characteristics can be accurately reflected. The accuracy and structure of the equipment used in the differential pressure method are clearly stipulated, and the test operation process is standardized, covering key links such as test environmental conditions, pressure difference setting and measurement time. According to this standard, the ventilation performance of rubber can be accurately determined, providing key data for the rational application of rubber in the fields of sealing and protection, and helping related industries to improve product mass and performance.