The GB/T 12585-2020 standard is used to determine the transmission rate of volatile liquids to sheets and coated fabrics of vulcanized rubber or thermal plasticity rubber, using the mass method. The standard specifies a detailed test procedure, including equipment requirements, sample preparation, test procedures and result calculation. With this standard, the rate of volatile liquid transmission through the relevant rubber material can be accurately quantified, providing a basis for evaluating the barrier performance of the material in the context of exposure to volatile liquids, and assisting Product Research & Development and quality control. It is widely used in rubber material production and related application industries.