Shor platinum investment is especially compounded for the casting of platinum, palladium and other high-temperature metals. When used in accordance with instruction, it will consistently give sound, smooth castings.
Before opening the drum, roll and tumble it end over end for at least five minutes to assure uniformity of the powder. Platinum investment powder tends to separate into its ingredients during transport and storage. To minimize this, Shor Platinum Investment is packaged only in 25 pound drums, which are easy to roll and tumble to insure uniformity of the powder. Packaging in larger drums would increase the rate of ingredient separation, and the drums would be too large to allow for convenient mixing of the powder.
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Because of its extremely high melting point, platinum chills very quickly when the torch flame is removed. A casting machine with a very quick start, such as the Shor Platinum Casting Machine, must be used if melting the platinum by torch. Alternatively, high frequency machines, such as the Shor Induction Platinum Casting Machine can be used.
With natural gas, an oxygen pressure of about 40 psi should be used and the flame should be adjusted to have a very short inner cone about 1/2" long.