The hydrolytically stable polyphosphonate is moldable and preferably can be made to have one or more of the following properties including transparency, a Tg at least 100??? C. (when the hydrolytically stable polyphosphonate is made from a polyphosphonate prepared with bisphenol A or a mixture of bisphenol A and other bisphenols wherein the amount of bisphenol A in the mixture may range from less