What is silicone casting?
Silicone casting (silicone mold making) pours a two-part reactive silicone over a master pattern so it cures into a flexible mold. That mold is then used to cast polyurethane, resin, wax, or other materials. The two parts — usually a base and a catalyst — must be combined at the correct ratio and mixed evenly, or the silicone cures soft, sticky, or unevenly.
- Flexible two-part molds for casting PU and resin parts
- Pattern duplication for prototyping and short runs
- Art, jewelry, props, and architectural model molds
Why mixing silicone by hand is hard
- Ratio drift: Eyeballed or hand-weighed batches vary, leading to soft spots and incomplete cure.
- Trapped air: Hand-stirring folds in bubbles that telegraph into the mold surface.
- Waste and rework: A bad batch means re-pouring an entire mold.
How Flovv helps
Flovv is purpose-built for two-component (A:B) reactive systems: it meters both parts at a precise, repeatable ratio and mixes them in-line through a static nozzle, which reduces trapped air compared with hand mixing. Process notes: confirm your silicone's mix ratio and viscosity, work within its pot life, and pour slowly from a low height for the cleanest mold surface.
Honest scope: Flovv handles two-part reactive materials well, and silicone-compatible workflows are expanding with our material lineup — but silicone systems vary widely in ratio and viscosity. We don't claim full out-of-the-box support for every silicone, so talk to us about your specific silicone system first. Ready to move? See the Flovv injection system or browse the full shop.