HDPE is a lightweight, low-friction thermoplastic with excellent chemical resistance and very low moisture absorption, suited to food-processing items and fittings, though it is soft and expands with heat.
HDPE (high-density polyethylene) is a lightweight thermoplastic with excellent chemical resistance, very low moisture absorption, low friction, and good machinability. It is soft and not stiff, expands roughly ten times as much as steel with temperature, creeps under sustained load, and suits continuous use only up to about 80–90 °C. Some grades are prone to stress cracking.
CNC-machined HDPE is a good option for food-processing items, industrial fittings, and low-load sliding parts.