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