A composite of polyetheretherketone (PEEK) film, acrylonitrile butadiene rubber (NBR), and fluoroelastomer (FPM) is for low-permeability seals. PEEK provides strength and rigidity with minimal creep while the rubbers resist heat and chemical corrosion. The resulting composite hasĀ  low creep under high mechanical loads, little expansion in the presence of fluids and steam, high chemical resistance, and very low permeation.

Victrex Polymer Solutions, www.victrex.com
Daetwyler, www.daetwyler-rubber.com