... standards3. Product export countries:Europe,South America,Africa,Middle East and South-East Asia,Their good quality has got a favorable appraisal ... pearlite grades of ductile lron>grade three(GB9941-88)6.Type of joint:.Push-on joint(Ttype) including Spigot end, ... rubber gasket,anti-forrosive layer,T-bolts&nuts Socket end,flange joint(flange type)including flanged fittings,rubber gasket,flange-bolts& ...