Pneumatic slurry knife gate valve Ductile Iron- Gr. 60-40-18, 65-45-12, 80-55-06 Grey ... sand*Investment sandCommon Alloys produced are:ASTM A 128 Gr.A, Gr.B, Gr.C, Gr.EHeat resistant steel*Green sand*Olive sand*Polymer ... :Gray Iorn-Class 25, Class 30 and Class 40Ductile Iron-Gr,60-40-18,54-45-12Aluminum Casting*Dry sand*Permanent ...