... ANSI B 16.48Types : Welding Neck flanges , Slip On flanges , Threaded flanges , Socket Welding flanges , Blind flanges , Orifice flanges , ... 2638 , DIN 2673Types : Welding Neck flanges , Slip On flanges , Threaded flanges , Socket Welding flanges , Blind flangesPressure Grade : 6 Bar , ... of acid and alkali resistance9. Technics: forged, CNC machined product factory certified production process