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The correct mixing ratio is the foundation of reliable, long-lasting silicone moulds. Whether you’re crafting at home or working on professional castings, understanding why these ratios matter ensures successful results every time.
The Importance of the Right Ratio
Silicone mould putties and rubbers are typically made by mixing two components—often in a 1:1 ratio, as with “I–Gum” Silicone Putty. This precise balance allows the mixture to cure properly. If the ratio is off, you might end up with a mould that remains sticky, cures unevenly, or is too fragile to use. Each manufacturer provides specific instructions for their formulation, so always check the packaging for guidance before mixing.
Practical Tips for Measuring and Mixing
For best results, use clean, accurate tools to measure out the two parts. Mix thoroughly until the colour and consistency are uniform—this ensures the chemical reaction happens evenly throughout the putty. You can work without gloves with non-toxic putties such as I–Gum, but keep your workspace free of contaminants and avoid rushing the mixing process.
- Use equal parts by weight or volume as directed.
- Combine small batches if possible to reduce error.
- Mix until no streaks remain for a homogeneous finish.
When This Matters Most
Getting the ratio and mix right is especially crucial when making detailed or reusable moulds, or when using valuable materials for casting. Properly mixed silicone helps prevent wasted time and materials, making your moulds more durable and effective for multiple pours.
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Understanding the importance of mixing ratios helps you create silicone moulds that perform reliably, whether for crafts, resin art, or more demanding casting projects. For more in-depth guidance on successful mould making, see our main advice on how to make a silicone rubber mould.