These are sheet gaskets made of VALFLON™ (PTFE) with excellent chemical resistant and non-stick properties. Black VALQUALON™ Gasket - Valqua® No. 7026 (For alkali) Similar to their companion products, the No. 7020 and No. 7026 gaskets have excellent heat resistance, chemical resistance, and anti-cold flow properties. Features: Excellent alkali resistance., Heat resistance, Anti-cold flow properties , Handling various chemical. Temperature: -200 to 200oC / -328 to 392oF, Pressure: Max 4MPa, Suitable fluids: General fluids (water, steam, oil, etc.), solvents, corrosive liquids (especially, alkali liquid), liquefied gas, cryogenic fluid, Applications: Pipe flanges, valve bonnets, towers & tanks, The ring molded article supports JPI (ASME / ANSI)