TECAFORM® AH Rod, Double Annealed

TECAFORM® AH is an unfilled acetal copolymer (POM-C) supplied as extruded rod and plate and as calendered sheet. Engineers specify it for stiffness and dimensional stability: tensile strength runs about 9,300 psi at yield with flexural strength near 13,000 psi and Rockwell M86 hardness, and it holds tolerance because it takes on very little water, roughly 0.18% in 24 hours and 0.80% at saturation. Dynamic coefficient of friction is about 0.21, giving predictable unlubricated wear behaviour. Copolymer chemistry handles hot water and alkaline cleaning chemistry better than homopolymer acetal, and the extruded stock is free of centreline porosity.

It is the default choice for machined mechanical parts: gears, bushings, rollers, wear strips, star wheels, timing screws, valve components, manifolds and chain guides across food and beverage processing, packaging, conveyors, agricultural machinery and general automation. Long-term service temperature is about 195°F with intermittent excursions to 285°F. Qualifying grades are available with food-contact conformity documentation under FDA 21 CFR 177.2470 and EU Regulation 10/2011. It machines cleanly at high feed rates and polishes well, but it is difficult to bond, so design for mechanical fastening. Acetal is attacked by strong acids and oxidisers, and unpigmented stock has limited UV stability.