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 ... 05, Type 11, Type 12, Type 13, Type 21,EN1092-2, EN1092-3 ...