Platinum Casting

Platinum Casting
Platinum pendant and chain inset with diamonds Platinum tree supplied courtesy of Hean Studio Ltd, England

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Platin Cast

The extreme melting point of Platinum of up to 2000°C requires a specially formulated Investment Powder to cope with the intense casting conditions. Platin Cast 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 Platin Cast 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.

WATER TO POWDER RATIO32:100

DO NOT STEAM DE-WAX

MACHINE VACUUM MIXINGmin.
Weigh out water & powder0
Add powder to water
Mix under vacuum3
Pour flasks1
Vacuum flasks1.5
Total time taken 5.5
HAND MIX THEN VACUUMmin.
Weigh out water & powder0
Add powder to water
Mix by hand0.5
Mix with machine1.5
Vacuum mixer bowl1
Pour flasks1
Vacuum flasks1.5
Total time taken 5.5
Platinum Casting Graph

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.