Calculate Weight & Metal- Jewelry Casting Tips & Tricks
Because of high costs casters do not like to use every time fresh alloy. For some alloys
customers mix “second hand metal” up to 50 %, mainly Au, Ag based alloys. Please pay
attention to following:
- Never use finished jewellery pieces. The alloy composition is not known, solder in casting material will give no good casting result.
- Never mix two alloys, even if they have the same contents of gold.
- All already cast metal should be very clean, sand blasting and pickling are ade-
quate methods. Caution: rest of glass beads, investment material or rests of acid
are unwanted. Acid residues can be cleaned in ultrasonic bath wih distilled water - Alloys with zinc content: give a little bit more fresh metal to “old” metal
- Alloys with high carat (Pt. 950, Au 21/22/24 kt) can be re-used to 100 %
- Pd 950 is a very reactive metal. No chance to melt it twice. Use fresh metal!
- Prevent oxidation by melting under vacuum and protective gas only.
- Never use boric acid for melting!
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