HDPE and LDPE are two grades of thermosetting plastics made of ethylene monomers, whose properties differ from one another based on their structure.
HDPE has a higher density. Therefore, it is harder, has a higher chemical resistance and can withstand higher temperatures. It has little branching resulting in higher strength and stronger intermolecular forces. It is used to make things like bottle caps, corrosion protection for steel pipes, folding chairs and tables, chemical resistant pipes, plastic bags and water pipes.
On the other hand, LDPE is softer, more flexible and melts at a lower temperature than HDPE. Its strength is lower compared to that of HDPE.
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