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See Chinese contents: GB/T 14985-2007 GB/T 14985-2007: General rules of dimensions, shape, surface, quality, testing method and inspection for expansion alloys
This Standard specifies the dimensions, shape and allowable deviation, surface quality, testing methods, inspection rules, packaging, marks and quality certificates for expansion alloys. This Standard applies to expansion alloys with a certain average linear expansion coefficient within a certain temperature range.
