Metals Cast Gray Iron Class 25,30,35,40 tensile and heat resistant irons Specifications Gray Iron Specifications ISO 9000 Certification Pressure Equipment Directive Certification Ductile Iron Grades 60-40-18, 65-45-12, 80-55-06, 100-70-03 & 120-90-02 Specifications Ductile Iron Specifications ISO 9000 Certification Pressure Equipment Directive Certification Austempered Ductile Iron Grades 110-70-11, 130-90-09, 150-110-07, 175-125-04, 200-155-02 & 230-185-01 Specifications Austempered Ductile Iron Specifications ISO 9000 Certification