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See Chinese contents: GB/T 5721-1993 GB/T 5721-1993: General rules of identification, packaging, transportation and storage for rubber sealing products
This Standard specifies the general rules of identification, packaging, transportation and storage for rubber sealing products. This Standard is applicable to the rubber sealing products, such as O-rings, V-rings, rotary shaft lip type seals, etc. The rubber and other rubber products can be used as reference.
