Can anyone tell me the material of choice for bolting dual laminate (teflon/fiberglass) pipe flanges both flange to flange pipe and flange to steel(glass lined) vessel nozzle. Operating conditions are 100 psig, @ ambient, outdoors exposed to weather, pumping 100% bromine in the line. Currently using and ASTM 193 B7 but expeiencing rapid corrosion due to permeation of Br throught the teflon gasket.