GYLON® Style 3504 GarlockGYLON® Style 3504 gaskets are made of PTFE with aluminosilicate microspheres. It is designed for use in moderate acids, caustic, hydrocarbons, refrigerants, and more. Available in sheet or cut gasket form Blue PTFE with aluminosilicate microspheresMeet ABS, FDA and USP specificationsMin Temperature: -450 ° F / -268 ° CMax Temperature: 500 ° F / 260 ° CMax Pressure: 800 PSI / 55 barMaximum PxT 1/16: 350,000 ° F x PSIG / 12,000 bar x ° CMaximum PxT 1/8: 250,000 ° F x PSIG / 8,600 bar x ° CPTFE Gasket