A flange insulation kit consists of a flange gasket, bolts and insulating sleeves used to install a leak-proof flange. The insulating sleeves used in the kit are manufactured of a high-density, polyethylene plastic that prevents an electrical charge from dissimilar metals from causing corrosion and ultimately weakening and breaking a flange bolt. In place of a conventional nut and bolt system, the flange insulation kit uses a stud with a washer and nut on each end of the flange joint.
A concave PTFE Inside Diameter (ID) seal and a PTFE spring-energized face seal, or an elastomeric O-ring, seated in an insulating laminate and permanently bonded to a high-strength core
flange insulating gasket kits have main 3 types. Type E for FF flange, type F for raised face flange and type D gasket for RTJ flange
VCS flange insulation gasket kits, the VCS is a "Very Critical Service" flange gasket designed for electrical flange insulation and generaL sealing applications