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See Chinese contents: GB/T 19472.1-2019 GB/T 19472.1-2019: Polyethylene structure wall pipeline system for underground usage -- Part 1: Polyethylene double wall corrugated pipes
This Part of GB/T 19472 specifies the terms and definitions, symbols and abbreviations, materials, product classification and marking, pipe structure and connection methods, requirements, test methods, inspection rules and signs, transportation, storage of polyethylene double wall corrugated pipes for underground usage.
