... standard in accordance with ISO2531,Class K9, L=6000mm,2.T-Type joint and selfrestrained joint duictile iron pipe with cement lining ... pipes according to the european standard EN5457.matched all necessary T-type normal rubber gaskets in accordance with ISO4633. Ductile cast iron ... ferrite and a little pearlite,possessing excellen mechanical properties. ISO2531 T Type Centrifugal Ductile Cast Iron Pipe