How do I choose silicone suitable for both steel and rubber?

What Type of Silicone Works Best?

For use with steel and rubber, professionals often turn to platinum-based silicones or bi-component (A+B) silicone rubbers. These formulas offer both mechanical strength and the flexibility to produce detailed results, accommodating hard (steel, rigid resins) and soft (rubber-like) surfaces. Products such as “Pure Mould” translucent silicone and bi-component casting silicones are designed to adapt across a range of applications from artistic pieces to technical moulds.

Key Buying Considerations

• Detail Reproduction: Choose a silicone with a track record for capturing intricate features and undercuts—particularly important if your mould features fine textures or patterns.
• Mechanical Strength: Select a silicone noted for durability and resistance, especially when handling repeated demoulding or use with harder materials like steel inserts.
• Mixing & Curing: Look for options with a simple 1:1 ratio and manageable cure times, as this reduces margin for error and streamlines production.

Practical Tips for Application

Thoroughly clean all surfaces before pouring your silicone to avoid contamination and promote adhesion where needed. For moulds involving both steel and rubber inserts, ensure the silicone can flow easily into tight spots and around complicated features. Using a bi-component system, always follow the recommended catalyst ratio to achieve optimal curing. For intricate projects, selecting a translucent or clear silicone can help you monitor placement and bubble formation during pouring.