Polyacetal:           

This plastic is better known by its trade name Delrin. It is lightweight, has good tensile strength, and has good dimensional stability, resistance to temperature (115° C), resistance to creep and fatigue, low friction characteristics, resistance to most solvents and low moisture absorption. Delrin is made from acetal homopolymer resin & when extruded into large basic shapes (i.e.- sheets, rods & tubes) tends to be subject to porosity problems. These porosity problems can make the product less reliable in certain applications.

It has been developed as a material for mechanical parts including sprinkler nozzles, handles, gears, housings etc. It i widely used for stereo tape cartridges, toys, furniture casters and cigarette lighter cases. Delrin's resistance to liquids and low coefficient of friction have also made it useful as a bearing-replacement in casters and wheels. It has excellent durability; it is much more resistant to wear than nylon. Delrin is gaining popularity for the manufacture of diving equipment, due to its light weight and its low porosity to gas under pressure.