| PO |
Polyolefin (a class of polymers that includes PE and PP) |
| PP |
Polypropylene |
| HDPE |
High-Density Polyethylene |
| BOPP |
Biaxially Oriented Polypropylene (a specific film type of PP used for packaging) |
| PVC |
Polyvinyl Chloride |
| PPE |
Polyphenylene Ether (or Modified Polyphenylene Ether, a type of engineering plastic) |
| PPU |
There is no standard abbreviation PPU in common plastics terminology. It might be a misspelling of PSU (Polysulfone) or PU/PUR (Polyurethane). |
| CPE |
Chlorinated Polyethylene |
| LD |
Low Density (often used as a prefix to PE for Low-Density Polyethylene) |
| LDPE |
Low-Density Polyethylene |
