Rapid Results

Smaller flasks or small flask-less castings with no stones

This is an emergency burnout schedule. While Doc’s investment is designed to handle the stress, your casting surface may not be as smooth as it will be when using a less aggressive burnout schedule.

Note: Casting flask-less is ideal with this type of material

• Preheat your oven to between 1400F and 1600F
• About 1 hour after investing, put the flask into the preheated oven with the wax button facing down
• When the heavy smoke stops coming out of the exhaust on your oven, flip the flask over with the opening facing up
• If your oven was preheated to 1600F then a complete burnout of wax (Not Resins!) may be possible in as little as 30 minutes. When the flask opening looks clear and free of wax and carbon, you can turn the oven off and wait for it to reach the casting temperature that you are looking for or you can remove the flask from the oven and place it on a fireproof pad on your counter to cool.
  • Lower top temps and higher wax content require a longer top temperature dwell times and higher top temperatures and lower wax content require shorter top temperature dwell times.
• Your final flask casting temperature will vary and depends on the type of metal that you choose and the design of your parts.
• The use of an optical pyrometer is ideal for measuring the temperature of the inside of the flasks by pointing it into the pour hole of the flask to take a reading.
• When you have reached your desired casting temperature, load your flask into your casting machine and cast.
• Quenching this material will not cause the investment to break away from your castings. This step is done at the appropriate time to give the maximum benefit to your metal crystal structure. You will then need to break away the investment using a hammer or a high-pressure water blast cabinet.

Wax Setting Burnouts:

Special Considerations:

• Flask-less casting works great for stone in wax and is much easier to breakout after casting.
• Many stones can be used when casting with stones in place. When casting with stones in place using any investment material, it is essential to never exceed a top temperature of 1150oF during the burnout when casting with diamonds. This means a much longer burnout schedule is required. This is not the same with other stones but is a good rule of thumb.
• For typical casting with stones, a maximum temperature ramp schedule of 4 degrees per minute up or down is suggested.

Method:

• About 1 hour after investing, put the flask into an oven that is preheated to about 300oF (150oC), with the wax button facing down and hold at that temperature for about 2 hours.
• Ramp directly up to your top burnout temperature of about 1150oF and hold for about 4 hours.
• Lower top temps and higher wax content require a longer top temperature dwell times and higher top temperatures and lower wax content require shorter top temperature dwell times.
• It is always a good idea to flip the flasks over at the top temperature in order to allow combustion gases to escape the mold. This is especially true for stone in wax casting.
• Your final flask casting temperature will vary and depends on the type of metal that you choose and the design of your parts.
• You should never quench your flasks when casting with stones in place until you can hold the flask comfortably in your bare hand. It is best to allow them to reach room temperature.
• You will then need to break away the investment using a hammer or a high-pressure water blast cabinet. When casing with stones it is best to do this in a container that allows you to find any loose or missing stones.

Casting Temperature table

These are estimates based on general purpose casting.

Platinum 500-600F
950 Palladium 1000-1150F
Nickel white gold 1000-1150F
Palladium White gold 1000-1150F
Yellow Gold 850-1100F