Delrin® 527UV Plate

Delrin® 527UV is an acetal homopolymer (POM-H) carrying a UV and weathering stabilisation package, supplied in black so that pigment and stabiliser work together against sunlight. It keeps the mechanical profile engineers expect from homopolymer acetal: 10,300 psi tensile strength at yield, a 490,000 psi flexural modulus and 420,000 psi tensile modulus, 13,500 psi flexural strength, and 1.25 ft-lb/in notched Izod impact, with improved surface hardness at 120 on the Rockwell R scale. Moisture uptake is 0.14% in 24 hours and thermal expansion is 6.1 x 10-5 in/in/°F, so outdoor parts stay dimensionally predictable through wet and dry cycles.

It is specified where an acetal part has to live outside: agricultural machinery, construction equipment, solar mounting and tracker hardware, automotive exterior and under-body components, and outdoor conveying or irrigation gear. Machining is straightforward, with clean chip formation, good thread cutting, and fine achievable finishes using sharp carbide tooling. Long-term service temperature is 185°F and the UL 94 flammability rating is HB. The stabilisation slows but does not eliminate weathering, black is the only colour available, and like all acetal it is attacked by strong acids and strong oxidising agents.