GB/T 9348-2008 stipulates the determination method of the number of impurities and foreign particles in plastic polyvinyl chloride (PVC) Resin. The standard clarifies the determination principle, specifies the required equipment, sample preparation and operation process, specifies the key steps such as sampling, observation and counting, and specifies the result representation and precision requirements. It provides a unified technical specification for the accurate determination of polyvinyl chloride (PVC) Resin impurities and foreign particles, which helps to control product mass and ensure production and application performance.