Abstract: A low wear polyoxymethylene composition includes a polyoxymethylene matrix resin; from about 0.05 to about 3 weight percent of a high molecular weight polyethylene having an intrinsic viscosity of from about 3.5 dl/g to about 35 dl/g, with the provisos that the high molecular weight polyethylene is further characterized by either: (i) an intrinsic viscosity of less than about 10 dl/g; or (ii) a particle size, d50, of less than about 50 microns as provided to the composition. The composition also includes an oxidized polyolefin wax; and optionally includes one or more of additional lubricants, reinforcing agents and stabilizers. The compositions are useful for tribological applications and are used to make bearings, gears, cams, rollers, sliding plates, conveyor belt links, castors, fasteners, levers and the like.

Abstract: A molding composition exhibiting bleach resistance includes a polyoxymethylene matrix polymer, from about 0.5 to about 10 weight percent of a bleach stabilizer selected from alkali metal or alkaline earth element carbonates or phosphates and mixtures thereof dispersed in the matrix resin. A bleach co-stabilizer is selected from the group consisting of: (a) a poly(alkoxy) stabilizer; (b) a zinc oxide stabilizer; (c) a color stabilizer consisting of a mixture of calcium citrate and calcium propionate, wherein the calcium citrate is the predominant component of the color stabilizer mixture; or (d) mixtures of two or more of (a), (b) and (c). The compositions exhibit a bleach resistance index of at least 2.0.