... ISO4179, ISO8179, ISO4633, ISO7186, EN545, EN598, BS4772 Standard. Ductile Iron Flange pipe is mainly used for transferring the drinkable water ... and acid. With special ductile iron material, this series of pipe fittings can also be ... bitumen painting outside; Bitumen painting inside and outside; Red anti-rust coating. 4, package: Wooden cases with plastic layer, ...