Polyethylene's toughness, immunity from corrosion, excellent resistance to chemicals and low weight have contributed to its continued appeal for use in situations where cost-effective and reliable piping systems are required such as activities like horizontal direct drilling.
High-density polyethylene, unlike polypropylene, cannot withstand normally required autoclaving conditions. The lack of branching is ensured by an appropriate choice of catalyst (e.g. Ziegler-Natta catalysts) and reaction conditions.
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