Resin Cad Cam or Photopolymers

For those most difficult resin Cad-Cam models...

If you are using this material to simply overcome the defects that you encounter from the use of carving or RP waxes, you can just as well use a normal jewelry burnout cycle in the same oven as your normal daily production flasks.

Method B: (Smaller flasks or small flask-less castings)

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

· Program your oven controller for a ramp rate from 4 degrees per minute to a maximum of 10 degrees per minute. This investment material is very resistant to shock so your ramp up speed can be faster than with gypsum-bonded investment.

· About 1 hour after investing, put the flask into an oven that is preheated to about 300^oF (150^oC), with the wax button facing down.

· Ramp directly up to your top burnout temperature of about 1350^oF - 1600^oF, depending on the metal you are burning out. For photopolymer (Invision or resin based) use the 1600 degree peak temperature

· Hold your top temperature for 2 – 8 hours depending on the amount of material in the flask and the ending top temperature of your flasks. 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 around 1200^oF in order to allow combustion gases to escape the mold but is not necessary for longer burnouts.

· Your final flask casting temperature will vary and depends on the type of metal that you choose and the design of your parts.

· 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.