APG’s C-4500 - Carbon Fibers and Special Heat-Resistant Additive Sheets with Nitrile Binder is a premium grade, high-pressure gasket material designed for use in high-temperature alkaline media and superheated steam. C-4500 is a superior performance material suitable in the pulp and paper industry and the chemical industry. This material is manufactured with carbon fibers and special heat-resistant additives and reinforced with a nitrile binder.