Perfluoroelastomer has increased acid resistance
A
Precision Polymer Engineering product story
Edited by the Engineeringtalk editorial team
Apr 8, 2005
High performance seals specialist, Precision Polymer Engineering has expanded the scope for perfluoroelastomer seals in chemical processing with the development of Perlast G75B.
High performance seals specialist, Precision Polymer Engineering has expanded the scope for perfluoroelastomer seals in chemical processing with the development of Perlast G75B.
The new 75 Shore perfluoroelastomer offers increased acid resistance over other perfluoroelastomers.
Perfluoroelastomers are commonly used in chemical processes characterised by high temperatures and aggressive solvents.
Until now the FFKM elastomers have suffered from poor acid resistance leading to excessive compression set and increased seal maintenance downtime.
Perlast G75B is specially compounded to provide increased acid resistance by eliminating fillers that are prone to acid attack, and optimising the cure system.
Perlast G75B can be used in applications with temperatures ranging from -15 to +315C.
In addition to excellent chemical and temperature resistance and very good mechanical properties, the acid resistant perfluoroelastomer has low permeability.
As a result it is less prone to swelling, leading to extended in-service performance in valves and pumps.
According to International Perlast Business Manager, David Holt: "Perlast G75B fills an important performance gap in perfluoroelastomers used in chemical processes".
"The ability to extend the sealing life of the FFKM elastomer in acidic conditions will significantly increase plant productivity".
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.
Perlast seals exhibit resistance to high temperatures, toughness and flexibility at low temperature, nonadhesiveness and very low friction properties.
In addition, they are resistant to organic solvents, many aggressive chemicals, oils, fluids, have extremely low dielectric losses and high dielectric strength.
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.
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