BS blind flange 1.Standard:ASME , API, AWWA, BS, DIN, JIS,EN ... the special requirements of customers to provide all of the flange.Flange Material:CarbonsteelA105 / A266 / A350-LF1 / A350-LF2 / A516Gr70 / A515Gr65 / ... /F51FLANGE FACINGS :RAISED FACE, LARGE MALE-FEMALE, LARGE TONGUE AND GROOVE, SMALL TONGUE AND GROOVE, FLAT FACE , LAPPEDJOINT, SMALL MALE AND FEMALE , SMALL MALE AND FEMALE , RING JOINT