DELRIN(R) MATERIAL CHARACTERISTICS

Delrin(R) acetal resin, a product of DuPont, is formed from the polyme rization of formaldehyde. The tightly interlocked helical molecules an d high crystallinity result in excellent mechanical properties. Its su periority in tensile strength, stiffness, creep resistance, and fatigu e classify it as an 'engineering resin', a term used for plastics whic h can compete with metals in many applications. One of the important c haracteristics separating Delrin from other engineering plastics such as polyamides (nylons) is its very law water absorption and the small effect of aqueous solutions on its properties. The structure of Delrin is reviewed on several levels: chemical, crystallographic, lamellar, and spherulitic. The relationship of the structure to the properties o f moldings of Delrin is discussed.