... standard : ANSI B16.9 3.size : 1/2"-100" 4.certificate : ISO large diameter stainless steel forged flange ... class150/300/600/900 size1/2"-48"TypeLap-Joint Flange (LJ), Socket- ... 150, CLASS 300, CLASS 400, CLASS 600, CLASS 900, CLASS 1500, CLASS 2500European SeriesPN 2.5, PN 6 ... PN 16, PN 25, PN 40, PN 63, PN 100, PN 160, PN 250, PN 320, PN 400StandardHG20592, ...