... Flange 1. ASME FlangesSTANDARD:ASME B16.5, ASME B16.47,ASME B16.48,ASME B16.36,ANSI/AWWA C207PRESSURE GRADE:Class150,Class300,Class600,Class900,Class1500,Class2500MATERIAL: ASTM ... ,PN40 5. ISO Flanges STANDARD: ISO 7005-1PRESSURE GRADE:PN2.5,PN6,PN10,PN16,PN25,PN40,PN50,PN110,PN150, PN260,PN420 Forged Carbon Steel Flange