... Other names[hide]polybutene-1, poly(1-butene), PB-1IdentifiersCAS number9003-28-5PropertiesMolecular formula(C4H8)nDensity0.95 g ... weight, linear, isotactic, and semi-crystalline polymer. PB-1 combines typical characteristics of conventional polyolefins with certain ... standards set minimum performance requirements for pipes made from PB-1 used in hot water applications. Standardised extrapolation ...