Sheet gasket material is intended for non-propulsion and propulsion use in steam piping joints for service up to 150 lb/in² gauge, 425°F (218°C), and for use in water service applications up to 400 lb/in² gauge, 300°F (149°C). Sheet gasket material is also intended for use in lube oil service up to 150 lb/in² gauge, 250°F (121°C) and for use in all petroleum based hydraulic oil service applications up to 600 lb/in² gauge, 180°F (82°C). Gasket material designated in this specification is generally described in ASTM F 104 as type 7, class 1 or class 2 material.