... pearlite grades of ductile lron>grade three(GB9941-88)6.Type of joint:.Push-on joint(Ttype) including Spigot end,EPDM ... -forrosive layer,T-bolts&nuts Socket end,flange joint(flange type)including flanged fittings,rubber gasket,flange-bolts&nuts.7.Hydrostatic ... Test Pressure Diameter:DN50-300 fittings 25 bar Diameter:DN350-800 fittings 16 bar8.flanged drilling standards:PN10 ...