Commonly used when the requirements for strength, durability, chemical resistance, flexibility, and the like are not particularly strict.

SymbolMaterialExample Grades
HDPE High Density Polyethylene Marlex/Marflex, Dow, Ineos, Sclair
PP Polypropylene Flint Hills Resources, Ferro, Hostacom
LDPE Low Density Polyethylene Dow, Exxon Mobil, Westlake, Ineos
LLDPE Linear Low Density Polyethylene Dow, Exxon Mobil, Westlake, Ineos
PS Polystyrene Ineos Nova, Americas Styrenics
HIPS High Impact Polystyrene Ineos Nova, Americas Styrenics
PETG Polyethylene Terephthalate Glycol Eastar