Chemical composition of the ductile iron 
in the Forward Shielding (excluding iron):

C:   3.45-3.59%
Si:  2.12-2.28%
Mn:  0.11-0.15%
P:   0.014-0.021%
S:   0.004-0.006%
Cu:  0.03-0.06%
Mg:  0.041-0.049%