RBC offers a complete line of epoxy casting resins that can be used to duplicate any item, in conjunction with our GI-1000 RTV Silicone This system offers no shrinkage, no polishing, and no degating. These casting resins can be used to duplicate stones, mechanical parts, scrimshaw, and prototypes! The GI-1000 Silicone will pick up and retain the most intricate details of your model and is simple to use. Our epoxy casting resins and GI-1000 RTV Silicone are non-hazardous.
Making the Molds
- Line bottom of aluminum tray or cardboard mailer with double-faced tape (enough to secure models).
- Attach high polished models to tape. Models must have flat backs and be highly polished, without any imperfections.
- Mix GI-1000 RTV Silicone as directed. Pour just enough to cover models. Let sit for a minute so the silicone can release air. Pour the rest of the silicone over the first pour, up to 1/4" in depth over the models.
- Mold should be cured 24 hours at room temperature before using. For extended mold life, allow mold to cure 48 hours prior to use.
- Remove silicone mold from model after allowing it to return to room temperature.
Making the Casting
- Preheat resin to 90oF. Mix two parts resin to one part hardener by weight. Stir gently for 2-3 minutes with a mechanical mixer. Avoid whipping excessive amounts of air into mix! Vacuum to remove any entrapped air.
- Place mold on warming tray. Temperature should be set at 190oF. Pour epoxy into corner of mold and allow material to flow throughout. If you are not using a warming tray, place in oven at 100oF for 1-2 hours or until piece becomes hard. Curing at higher temperatures will shorten the mold's life.
- Remove pieces from mold after allowing it to cool to room temperature.
Open Pour Casting in Epoxy
- Aluminum Tray (cooking tray, deep enough to cover models)
- Cardboard Mailer
- Double-Faced Tape
- GI-1000 RTV Silicone (see Silicone Molding page)
- High Polished Models
- Epoxy Casting Material/LV-7 Resin, AB-97 Hardener
- Vacuum Jar
- Oven or Warming Tray