Blue plastic sheets are primarily manufactured from Polyethylene (PE), Polypropylene (PP), Polyvinyl Chloride (PVC), or Polycarbonate (PC). PE sheets (especially HDPE) are ideal for heavy-duty liners and outdoor covers due to their moisture resistance. PP sheets are preferred for chemical tanks and food-grade packaging because of their high heat resistance. PVC sheets are widely used in construction and signage for their flame retardancy, while PC sheets are the go-to for shatterproof glazing and roofing due to their high impact strength.