Casting molten metals?
What mold materials are suggested for making cast duplicates of metal objects Metals that may be used in some of my planned projects may include aluminum, brass, bronze, mild steel, and the like. (Jewelry, belt buckles, as well as similar items are planed)
I realize that the high temperature may be a problem in material choice for the molding material(s). I think mild steel is the highest melting temperature of all the metals I've considered, and it's about 2700°F (1482°C). (Suggestions for easier to work with metals or hard casting materials would be happily accepted, considering I'm looking to make a set of reusable hard positives to make casting negatives for larger numbers of final product.)
The choices I make for FINAL material will also include how well they can be plated, so steel may be for an intermediate mold positive, and something more easily plated (with yellow gold) like brass would be a final choice. Though, I may go for highly polishing the brass and then covering it with a corrosion inhibitor to avoid the high cost of gold.