Mayroong anim na pangunahing kategorya ng mga karaniwang ginagamit na plastik, polyester (PET polyethylene terephthalate), high-density polyethylene (HDPE), low-density polyethylene (LDPE), polypropylene (PP), polyvinyl chloride ( PVC), polystyrene (PS). Ngunit, alam mo ba kung paano makilala ang mga...
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