Blind flange 1,Material: Stainless Steel, Carbon Steel, Alloy Steel 2 ... From1/8" to 64" 3,Standard: ANSI,DIN,BS etc. Blind flange Production standard: GB/T9112~9124-2000 JB/T81-94 ... Neck Flanges, Slip on Flanges, Threaded Flanges, Socket Welding Flanges, Blind Flanges, Orifice Flanges, Lap Joint Flanges, Ring Joint Flanges, Long ... with polyethylene film steel cases or as customer’s request. Blind flange