Silver and Gold Casting
Gold Star Powders has travelled the world to source the highest quality, pure raw materials and additions, to ensure premier performing consistent products are produced. Both Gold Star XL and XXX benefit from the high quality cristobalite that is tailored to our exact specification and manufactured at our sister company's calcining and grading division in Derbyshire, England. Gold Star powders recommends two investments for the casting of all Silver and Gold alloys both yellow and white up to 18ct, with the exception of 18ct Palladium White Gold (see Omega+ for 18ct Palladium White Gold casting).
Each of these competitively priced products produces excellent surface finish, a strong mould, and "cleans off" the casting easily. They are both suited to centrifugal and vacuum assisted casting methods, and, where vacuum flasks are used, a fast burnout cycle can be used.
Gold Star XL
Gold Star XL has been our greatest volume investment powder over the last decade, with a proven track record of success. XL will meet the demands of casting Silver and Yellow Gold up to 18ct.
Gold Star XXX
We are always seeking to improve upon our products; we were continually being asked for a cost effective quality investment powder which will cast both Yellow and White Gold alloys up to 18ct (with the exception of 18ct Palladium White Gold). Our Research and Development Team, supported by our own Calcining and Milling Facility, introduced Gold Star XXX which filled the prescription perfectly.
| WATER TO POWDER RATIO |
|
MACHINE VACUUM MIXING | 38:100 |
|
HAND MIX THEN VACUUM | 40:100 |
|
Use de-ionised water Weigh water and powder Slurry temperature 21°C Leave for 90 min to stand before burnout |
| MACHINE VACUUM MIXING | min. |
| Weigh out water & powder | 0 |
| Add powder to water |
| Mix under vacuum | 1 |
| Stop mixer and scrape blades | 0.5 |
| Mix under vacuum | 3.5 |
| Pour flasks | 2 |
| Vacuum flasks | 1 |
|
Total time taken |
8 |
| HAND MIX THEN VACUUM | min. |
| Weigh out water & powder | 0 |
| Add powder to water |
| Mix by hand | 1 |
| Mix with machine | 3 |
| Vacuum mixer bowl | 1 |
| Pour flasks | 1 |
| Vacuum flasks | 2 |
|
Total time taken |
8 |
Do not remove flasks from furnace to cast until they have been held at casting temperature for a minimum of 1 hour. If 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.