Platinum Casting
Pro-HT Platinum
The extreme melting point of Platinum of up to 2000°C requires a specially formulated Investment Powder to cope with the intense casting conditions. Pro-HT Platinum is a water-based Phosphate-bonded Investment Powder, which has been successfully used for the casting of Platinum alloy for many years.
Traditional Platinum casting investments use a 2-part acid-bonded chemical reaction to attain mould strength at an elevated temperature, whereas Pro-HT Platinum utilises a water-based, phosphate-bonded chemical system and sets in an exothermic reaction at room temperature.
The mixing process is similar to a plaster-bonded investment such as Omega, where the powder is added to the water in a mixing bowl, mixed for the correct length of time, vacuumed in the bowl and then poured into the flask, vacuuming once again.
After investing, the mould is allowed to bench-set for two hours, by which time it has set and the rubber base can be removed and the mould placed into the furnace.
- Waxes and Resins should be stored at the correct temperature as suggested by the supplier.
- After production, resin patterns should be cleaned and allowed to dry before being stored in an airtight container with a silicon absorption pad.
- The patterns should then be placed into a sealed container with a silicon gel bag.
- Patterns must not be taken out of the sealed container or excessively handled until ready for spruing.
|
Links

|
| WATER TO POWDER RATIO | 35:100 |
DO NOT STEAM DE-WAX |
| MACHINE VACUUM MIXING | min. |
| Weigh out water & powder | 0 |
| Add powder to water |
| Mix under vacuum | 3 |
| Pour flasks | 1 |
| Vacuum flasks | 1.5 |
| Total time taken | 5.5 |
|
| HAND MIX THEN VACUUM | min. |
| Weigh out water & powder | 0 |
| Add powder to water |
| Mix by hand | 0.5 |
| Mix with machine | 1.5 |
| Vacuum mixer bowl | 1 |
| Pour flasks | 1 |
| Vacuum flasks | 1.5 |
| Total time taken | 5.5 |
|
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.