1) Standard: ANSI, DIN,BS, JIS, UNI, etc 2) Material: 304, 316, 304L, 316L, 321, ... ,DIN2527,DIN2558,DIN2568,DIN2569,DIN2576,DIN2628,DIN2630,DIN2631,etc.5. BS Standard flangesEN1092-1: Type 01, Type 02, Type 04, Type ... . South African Standard flangesBS4504: 6/3, 10/3, 16/3, 25/3, 40/3SABS1123: 600/3, 1000/3, 1600/3, 2500 ...