Seals offer better resistance to acid

High performance seals specialist Precision Polymer Engineering has expanded the scope for perfluoroelastomer seals in chemical processing with the development of Perlast G75B, which offers increased acid resistance over other perfluoroelastomers. Developed by PPE, the Perlast range of perfluoroelastomers are fully-fluorinated terpolymers made up from tetrafluoroethylene (TFE), perfluoromethylvinylether (PMVE) and a cure-site monomer, placing them at the high end of FFKM performance. Perfluoroelastomers are commonly used in chemical processes characterised by high temperatures and aggressive solvents. Perlast G75B, usable in applications with temperatures ranging from -15°C to +315°C, is specially compounded to provide increased acid resistance, eliminating fillers that are prone to acid attack and optimising the cure system. In addition to good chemical and temperature resistance and mechanical properties, the acid resistant perfluoroelastomer has low permeability, meaning that it is less prone to swelling and consequently offers extended in-service performance in valves and pumps. Perlast seals also exhibit toughness and flexibility at low temperatures, non-adhesiveness and very low friction properties. Perlast is also available in FDA-compliant grades to meet the regulatory standard 21CFR 177.2600 and 2400 for rubber articles intended for repeated use in food manufacture, as well as grades for Food Contact Notification (FCN), USP Class VI, and 3-A Sanitary Standards Inc. Enquiry card number: 103