A relatively inexpensive plastic that is used in large quantities in miscellaneous goods, home appliances, automobiles, industrial materials, etc. Representative general-purpose plastics include high-density polyethylene (HDPE), low-density polyethylene (LDPE), polypropylene (PP), polyvinyl chloride (PVC), and polystyrene (PS) and others. We use PP to produce the exterior and interior of automobiles.