... FlangeType:Slip-On, Welding Neck, Blind, Socket Welding, Threaded, Lap Joint and Plate,etcDimensions:DN10-DN2000Pressure:150lbs-2500lbsPressure grade:0. ... ,class 2500Sealing Surface:FF, RF, LJ, TG, FM, and R.T.J. etcMaterials:Carbon Steel: ASTM A234WPB,WPC;ASTMA420 WPL9, WPL3 ... the production process are made under the ISO9001:2000 strictly. Lap Joint Flange