raised face long weld neck flange 1.Resistance to corrosion. 2.Acid and alkali resistant 3.High temperature resistant raised face long weld neck flange Welding Neck Flanges, Slip on Flanges, Threaded Flanges, Socket Welding Flanges, Blind Flanges, Orifice Flanges, Lap Joint Flanges, Ring Joint Flanges, Long Welding Neck Flanges, Figure 8 Blanks Hubbed Slip on Flanges ,Hubbed Threaded Flanges , ...