The flange insulation sets Guardian Premium IS do not use any metal support and the GRE is both a retainer and an insulator. The gasket can be used on the RF, FF and even RTJ flanges to replace the inefficient Phenolic Ring Joint. The seal could be made both with PTFE or with nitrile or fluorinated rubber. The groove for housing the gasket is shaped in such way to prevent breakage of the retainer in case of overstress and to give greater elasticity to the sealing element. The flange insulating kit Guardian Premium IS is applicable up to 200 ° C depending on the GRE selected, in ANSI 150 - 1500 #, API 2 - 5K # and PN 6 - 250 # ratings.