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See Chinese contents: GB/T 13521-1992 GB/T 13521-1992: Crown cap
This Standard specifies the basic dimension, technical requirements, test methods, inspection rules, marks, packaging, transportation, and storage of bottle caps which are for beverages such as beer and soft drinks, and which are made of electro-tinned (or electro-chromed) tinplate. This Standard applies to the bottle cap for sealing which complies with GB 10809.
