1. Examples of nitrile rubber which have been tested are “Philprene” (registered trademark of Phillips Chemical Company), “Hycar” (registered trademark of B. F. Goodrich Company), and Buna N. Philprene is a terpolymer of methyl vinyl pyridene-butadiene-acrylonitrile, Hycar is described as a carboxylated nitrile rubber, and Buna N is a butadiene-acrylonitrile copolymer.
2. “Viton” and “Mylar” are registered trademarks of E. I. duPont de Nemours and Company, Inc. Viton is a copolymer of hexafluoropropylene and vinylidene fluoride. Mylar is extruded sheeting of poly (ethylene terephthalate).