└ Materials
         ├ building material
         │ └ raw materials
         │    └ Plastic material
         └ Resins, plastics
            ├ Acrylic, acrylic sheet
            ├ nylon
            ├ PET
            ├ polyethylene
            ├ polyvinyl
            ├ polypropylene
            ├ polystyrene
            ├ Bakelite
            ├ epoxy
            ├ polyester
            ├ silicon
            ├ polyurethane
            └ Other resins and plastics
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