(~O-CH₂OH) POM, but these lack sufficient thermal stability to be commercially viable. The inventor of a heat-stable (and therefore useful) POM homopolymer was Stephen Dal Nogare, who discovered that reacting the hemiacetal ends with acetic anhydride converts the readily depolymerizable hemiacetal into a thermally stable, melt-processable plastic.

In 1960, DuPont completed construction of a plant to produce its own version of acetal resin, named Delrin, at Parkersburg, United States.