Ring Flange Gasket Gasket Material PTFE Insert Material Aluminosilicate Microspheres For Pipe Size 2 1/2 in For Flange ANSI Class 150 Binder Material None Color Blue Inside Diameter 2 7/8 in Minimum Operating Temperature -450 Degrees F Maximum Operating Temperature 500 Degrees F Outside Diameter 4 7/8 in Thickness 1/8 in Gasket Type Ring Gasket Metal Detectable Gasket No Included Fasteners Not Applicable Hardness Not Rated Includes Mounting Hardware No X-Ray Detectable No