Polytetrafluoroethylene (PTFE) is an engineered fluoropolymer commonly known by DuPont's trade name "Teflon". Outstanding resistance to chemicals is one of it's primary attributes. A broad temperature range of -100F to 500F (-73C to 260C) make this hose core material suitable for the majority of fluid and ambient temperature conditions found in industry. An extremely low coefficient of friction, (0.05 to 0.20), provides a non-stick surface.Water absorption of PTFE is negligible, less than 0.01% by ASTM test. And, it is FDA-approved for food and pharmaceutical use. Smooth Bore PTFE hose is vertically extruded to maintain highest quality concentricity. TechAFX hose is manufactured from DuPont's type 62 fine grade resin, encasing braided 304 stainless steel wire. An exact amount of carbon black added to the PTFE inner core provides continuous conductive path to the metal end fittings, to bleed off static electricity in steam or high flow rate applications. Specs: For continuous service: -65¡F to 450¡F (-54¡C to 232¡C) For intermittent service: -100¡F to 500¡F (-73¡C to 260¡C) Meets or exceeds requirements of SAE100R14. PTFE meets FDA 21 CCFR 177.1550 Sizes -4 thru -10 are rated for full vacuum.