| Purpose |
-
#99 Alloy Replenisher is designed to de-oxidize
used gold for casting.
-
Can be used for yellow and white gold.
|
| Mixing |
-
10K scrap - Add 5 dwt #99, and 3.57
dwt of fine gold for each 100 dwt of 10K scrap being melted.
-
14K scrap - Add 4 dwt #99, and 5.60
dwt of fine gold for each 100 dwt of 14K scrap being melted.
-
18K scrap - Add 2 dwt #99, and 6.00
dwt of fine gold for each 100 dwt of 18K scrap being melted.
-
For white gold, the above ratios can
be used, but use will be limited to 1 or 2 times due to the yellowing of
the white color.
-
If #99 is to be used with scrap and fresh
mixes in continuous reuse, use ½ of the amounts listed above. This
will prevent excessive buildup of deoxidizers in the metal.
|
| Melting |
-
Place #99 in bottom of crucible when melting,
with scrap on top.
-
When the mixture becomes fluid, stir with
a carbon or quartz rod to clean surface of any oxides produced.
-
Fluxing may be necessary, depending on condition
of old gold. Boric Acid is the recommended flux.
-
#99 will work best when old metal is clean
from heavy surface oxides and investment powder.
-
If metal is contaminated with cuprous oxide
(the red copper oxide), only limited positive results can be expected.
|
| Notes |
-
Use carbon rods only with gas fired furnace
or torch melt.
-
Quartz rods should be used for all electric
induction melting.
|
