This European Standard defines the grades and the corresponding requirements of spheroidal graphite cast iron. This European Standard specifies a classification based on mechanical properties measured on machined test pieces prepared from: - separately cast test samples; - cast-on samples; - samples cut from arom a casting. This European Standard also specifies a classification as a function of hardness. This standard does not apply to spheroidal graphite cast iron used for pipes, fitting and accessories which are the subject of EN 545, EN 598, EN 969 and ISO 2531.