NON PRECIOUS STONES
For non precious stones you can use a normal investment powder – NO SPECIAL ADDITIVES ARE REQUIRED. SRS recommends SRSCLASSIC ™ or SRS GLOBAL™.
Once the choice of investment powder has been made mix and pour your flask as normal taking care not to dislodge any stones. Allow to stand for 2 hours prior to starting the dewax or burnout cycle.
DEWAX AND BURNOUT CYCLES
SRS do not recommend steam dewaxing for stone in wax casting of diamonds or precious stones where a special investment or additive has been used. There is a danger that the steam will wash away the additive protecting the diamonds. If you do steam dewax take great care that the steam is not too aggressive.
There are however good reasons for using steam dewaxing.
Wax carbons must be removed as much as possible at the beginning of the cycle end since the burnout temperatures are lower in the stone in wax processResidual carbon left in the mould can result in metal casting defects and effect the quality of the metal in the final product.Load flasks into a pre-heated steam de-waxing unit and de-wax for one hour then transfer the flasks immediately into a pre-heated oven set at 150° C (302° F)Do not allow the flasks to cool down below the boiling point of water, (220° F). This will help reduce the chance of any rapid heat changes that can stress some stones set in wax, facilitating and speeding up the wax elimination process.
BURNOUT CYCLE FOR STONECAST INVESTMENT (DIAMONDS & PRECIOUS STONES)
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