What is Delrin Homopolymer « Plant Engineer Today
Is an excellent choice for its long term mechanical stability in applications such as Valves, Washers, Gears, Bushings, Bearings, Seals, Rollers, Timing Screws, Electrical Components and Anti-Friction Parts. It is important to note that although Delrin is strong mechanically, and offers excellent resistance to moisture, gasoline, solvents, and many other neutral chemicals, it cannot tolerate acidic conditions long term.
Delrin is the trade name DuPont gave homopolymer.
ProblemsAcetal resins are sensitive to acid hydrolysis and oxidation by agents such as mineral acids and chlorine. POM homopolymer is also susceptible to alkaline attack and is more susceptible to degradation in hot water. Both POM homopolymer and copolymer are stabilized to mitigate these types of degradation.
Thus low levels of chlorine in potable water supplies (1–3 ppm) can be sufficient enough to cause stress corrosion cracking to develop, a problem which has been experienced in both the USA and Europe in domestic and commercial water supply systems. Defective moldings are most sensitive to cracking, but normal moldings will succumb if the water is hot.
Widespread failure of acetal mouldings in potable and hot water supplies resulted in one of the largest class actions in the USA when acetal plumbing fittings cracked and caused flooding of homes, a problem exacerbated by similar problems with polybutylene pipework. The acetal fittings tended to fail first, followed by the pipework that floods the structure.
Temp Rating For Delrin - Bookshelf
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