Calculate Weight & Metal- Jewelry Casting Tips & Tricks
To find out the weight of the metal
All rubber bases must be determined on a scale. Write exact weight on this rubber bases by a felt pen. After mounting the tree, take the total weight. Deduct the rubber base weight from the total weight = net wax weight. To simplify matters we assume the specific weight of wax as 1.
Metal weight is calculated by multiplying wax weight by the specific weight of the metal:
| Metal | Spec. weight in g/cm³ |
| Water, wax | 1.00 |
| Aluminium | 2.70 |
| Steel | 7.85 |
| Brass | 8.40 |
| Bronze | 8.80 |
| Silver | 10.50 |
| Nickel silver | 8.40 |
| Gold 333 | 10.90 |
| Gold 585 | 13.70 |
| Gold 750 | 15.20 |
| Gold 900 | 17.40 |
| Palladium 950 | 12.00 |
| Platinum 950 | 20.70 |
Example:
Complete weight (wax + rubber base) 43.5 g less weight of rubber base 38 g = 5.5 g wax.
5.5 g wax means
| Metal | Wax weight in g x Specific weight | Metal weight in g |
| Silver | 5.5 g x 10.5 | 57.75 |
| Gold 750 | 5.5 x 15.20 | 83.60 |
After the calculation: Place flask cylinder and fix it carefully on the rubber base. Do not touch wax pieces. Mark the rubber bases clearly to avoid confusion when you prepare several flasks!
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