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  1. Resin identification code - Wikipedia

  2. ISO 1043-1:2011— Abbreviated Terms for Plastics - ANSI Blog

  3. Plastics — Symbols and abbreviated terms — Part 1: Basic polymers

  4. ISO 1043-1:2011 - Plastics — Symbols and abbreviated terms — …

  5. Abbreviations of polymer names and guidelines for abbreviating polymer