Acetal, also known as delrin, is formed by polymerizing anhydrous formaldehyde to form an oxymethlylene chain. Acetal is used by RH Nuttall Limited to produce a variety of Acetal washers, Acetal gaskets, Acetal seals, and Acetal strip. Acetal is very strong and rigid and exhibits good chemical resistance.
Acetal is also a tough material with good dimensional stability, and a low coefficient of friction and therefore lends itself to a multitude of applications including gears, locks, and liners.
Acetal has an operating temperature range of -40 to +80°C, with a tensile strength of 8,800 psi, and a melting point of 160°C. Furthermore, Acetal has an excellent resistance to oils and alcohols, but a displays a poor resistance to acids. Adhesive backing can be applied to one or both faces if needed.