“แผ่นใสหรือแผ่นพลาสติก” is this transparent sheet made of (plastic film) low-density polyethylene (LDPE) or (clinging film) polyvinyl chloride (PVC) or (much thicker) polyethylene terephthalate (PET, soft drink bottles) or high-density polyethylene (HDPE) or polycarbonate (durable transparent plastic) or ?

The picture shows wobbles indicating thin (<5 microns in) thickness. Does the sheet stand up by itself?