Shenzhen Alu Rapid Prototype Precision Co., Ltd.

Yes, you can cast metal in silicone molds, but it works best with low-melting-point metals like pewter, pot metal, lead, or zinc alloys, as these don't exceed the typical heat tolerance of silicone (around 400–500°F or 200–260°C). Higher-melting metals like aluminum or bronze generally require more durable materials like graphite or steel molds, since silicone can degrade, burn, or release fumes at those temperatures (over 1,000°F or 540°C).

Why It Works for Low-Melt Metals

Silicone molds are flexible, easy to make (e.g., from 3D prints or originals), and release castings cleanly without much need for mold release agents.

Common applications include jewelry, props, or small parts, often using spin-casting or sling-casting techniques to ensure good flow and detail.

Tips for Success

Choose the right silicone: Use high-temperature formulations like Smooth-On Mold Max 60, which handles up to 560°F (294°C) for repeated casts.

Preparation: Preheat the mold slightly to avoid thermal shock, and work in a well-ventilated area to manage any vapors.

Process overview:Create the mold by pouring liquid silicone over your master object.

Melt the metal (e.g., pewter at ~450°F/232°C) in a crucible.

Pour or spin-cast into the mold and let it cool before demolding.