... poured into many types of castings such as sand, shell, investment, permanent mold, chemical sand, centrifugal, and die casting. The copper ... the temperature at which the metal is completely frozen. Group I alloys Group I alloys are alloys that have a narrow freezing ... , a range of 50oC between the liquidus and solidus temperature. Group I alloys includes: copper (UNS No. C81100), chromium copper ( ...