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Resin identification code - Wikipedia
ISO 1043-1:2011— Abbreviated Terms for Plastics - ANSI Blog
Polymer abbreviations - Distrupol
ISO 1043-1:2011 - Plastics — Symbols and abbreviated terms — …
Polymer Resin Identification Codes - Plastics and Recycling - AZoM.com
Plastic Resin Identification Codes - Justin Essler
Abbreviations of polymer names and guidelines for abbreviating polymer …