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Polyolefin
The polyolefin polymer is probably one of the most economical and widely used classes of thermoplastics, including such materials as PB, PP, and PE. PB is a semicrystalline polymer based on polybutene, homopolymers, and either polybutene or polyethylene copolymers. The primary use of PB is pipe with hydrostatic pressure rating of 1,000 psi at 73°F. PP is a crystalline polymer that has good resistance to caustics, solvents, acids, and other organic chemicals, but is not resistant to oxidizing-type acids, detergents, alcohols, or chlorinated organic materials. It is suitable for pipe applications. The largest group of polyolefins is linear PE. It includes ULDPE, LLDPE, LDPE, HDPE, HMW-HDPE, and UHMWPE. These density descriptions generally refer to ASTM designations based on unmodified polymers. PE types of higher density have better permeation barrier properties, hardness, abrasion resistance, chemical resistance, and higher surface gloss