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Air bubbles in liquid silicone moulds can compromise detail and durability. With the right techniques, you can achieve smooth, professional-quality moulds every time.
Take Care with Mixing and Pouring
To minimise trapped air, always mix your silicone components slowly and thoroughly, scraping the sides of your container. Fast or vigorous stirring introduces bubbles—steadiness is key. If possible, pour silicone in a thin, continuous stream from one corner of your mould box, allowing bubbles to rise to the surface naturally.
Use a Pressure Pot or Vacuum Chamber
For intricate or deep moulds where detail is crucial, a pressure pot can be invaluable. Placing your filled mould inside and curing under pressure compresses existing bubbles, making them virtually invisible in the final product. Alternatively, a vacuum chamber can help degas your mixed silicone before pouring, pulling out many of the air bubbles introduced during mixing.
When This Matters Most
- Detailed castings (such as jewellery or model figures) are most affected by bubbles.
- Fast-curing silicones allow less time for air to escape, so extra care is required when working with these products.
- Transparent or translucent silicones show imperfections more clearly, making bubble prevention even more important.
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Perfecting your silicone mould making routine minimises defects and ensures crisp results. For everything from clear liquid silicone like “Pure Mould” to user-friendly putties, following these bubble-busting tips supports professional outcomes across your projects. For more mould making guidance, explore our full range of silicone putty solutions.