Gem Set
Gem Set has been specially formulated to protect precious stones such as diamonds, when they are set into the wax patterns, burned out and cast , to ensure no damage to the stones during the burn out cycle. The maximum temperature achieved during the burnout cycle MUST not exceed 630°C.
Gem Set holds the stones in place during the dewax period, and protects them from the heat during the remainder
of the burnout process, andthe molten metal when cast. Gem Set will producehigh definition, clean surface castings,
with stones that remain as clear as they were before burnout.
Extensive permeability testing and development has taken place to ensure maximum carbon is released from the mould during burnout. It is formulated with the special additives to enhance stone-in-place casting results and improve cleanoff. Gem Set will cast all alloys melting below 1250°C.
WATER TO POWDER RATIO
- Machine Vacuum Mixing 38 : 100
- Hand Mix Then Vacuum38 : 100
Use de-ionised water
Weigh water and powder
Slurry temperature 21 ํC
Leave for 90 min to stand before burn out
| MACHINE VACUUM MIXING |
HAND MIX THEN VACUUM |
| 0 min |
Weigh out water & powder
Add powder to water |
0 min |
Weigh out water & powder
Add powder to water |
| 1 min |
Mix under vacuum |
1 min |
Mix by hand |
| 0.5 min |
Stop mixer and scrape blades |
3 min |
Mix with machine |
| 3.5 min |
Mix under vacuum |
1 min |
Vacuum mixer bowl |
| 2 min |
Pour flasks |
1 min |
Pour flasks |
| 1 min |
Vacuum flasks |
2 min |
Vacuum flasks |
| 8 min |
Total time taken |
8 min |
Total time taken |
| 90 min |
Remove tape from flasks after |
Do not remove flasks from furnace to cast until they have been held at casting temperature for
a minimum of 1 hour. lf held for less than 1 hour, the core of the flasks will be at a much higher temperature than the digital temperature display states, and may result in metal mould reaction.
