As severe applications increase, initial cost, at one time the greatest deterrent, is less of a consideration. Superior performance characteristics inherent in fluorocarbon rubber come to the forefront. This product is available in three quality levels. The hazard we are witnessing is using a commercial grade fluoroelastomer in a premium grade application. A failure in service is inevitable.
Commercial grade is the lowest priced, and often price overrides the reality of the application.
Commercial grade is often available from stock while premium grade is usually a production item with greater minimums. Competition forces the selection of the lowest priced fluoroelastomer just so the ultimate customer can get a rubber sheet with the tradename.