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    These manhole covers are primarily made of ductile iron (SG iron) or nodular iron a unique form of iron. Depending on the nodularity, the quality of the iron is determined whether it is good or bad. Ductile iron covers are known for their solidness, strength, heavy-duty, and resilient features. Ductile iron will not corrode as quickly as cast iron, as the manhole cover manufactures spray anti-rust asphalt paint at the surface of the covers. The loading classes for ductile iron manhole covers are subjected to BS EN 124:2015 guidelines and are predominantly used over a D400 class.