Tarson 50 Liter LDPE Carboy, model 583373, whose manufacturer is unknown. Tarsons low density polyethylene carboys are tested workhorses of the lab, offering rugged long-lasting construction. Low density polyethylene carboys provide very good chemical compatibility with a wide variety of lab reagents including most acids, bases, alcohols, aldehydes, esters, and aliphatic hydrocarbons. Low density polyethylene carboys are made only from high-quality laboratory-grade resin materials that comply with a number of regulatory specifications which includes USP Class VI.