3. cement lining inside and zinc and bitumen coating outside
Ductile iron pipes: 1. Standard: ISO2531: 1998/ BSEN545/ BS4772/ DIN2. Socket and spigot ends with flexible push on joints, Class K93. internal lining of cement mortar in accordance with ISO 4179: 1985, and external coating of zinc in accordance with ISO 8179: 1995 with a finishing layer of bituminous coating. 4. Effective length 6 meters or 5. 7 meters or 5. 5 meters for container loading. 5. Tensile strenth?420 Elongation?10% Hardness?230HB6. Passing ISO 9001: 2000, SGS & BV etc. certificates.