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See Chinese contents: QC/T 597.3-2019 QC/T 597.3-2019: Specification for fastener with adhesive coating - Part 3: Sealing coatings
This Part specifies the requirements, test methods, inspection rules, storage of nonreusable sealing coating, which is pre-applied onto the external thread fasteners, for the purpose of preventing leakage AND having the sealing function.
