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Pure Mould 20 shore silicone rubber is a popular option for creating detailed moulds used in wax injection and 3D liquid resin printed pieces. If you’re considering this material for your next casting project, here’s what you should know to achieve the best results and avoid common pitfalls.
Suitability for Wax Injection and 3D Resin Prints
Pure Mould silicone rubber is designed for versatile use, including moulding for hot wax, epoxy resins, polyesters, and 3D resin printed items. Its translucency aids visibility throughout the moulding process, and the 20 shore hardness strikes a useful balance between pliability and resilience. This makes it well-suited for capturing intricate details in both wax models and resin pieces.
The silicone cures in approximately 3–8 hours, allowing efficient turnaround for small to medium-sized projects. Its mechanical strength supports repeated use, making it a reliable choice for both hobby and professional settings.
Key Considerations: Shrinkage and Mould Size
One important aspect when working with Pure Mould silicone is slight shrinkage during curing, which becomes more noticeable as the size of your casting increases. For precision work, especially with larger or high-tolerance pieces, this factor should be planned for during your design stage.
- For small objects, shrinkage is typically minimal and unlikely to affect final results.
- For larger castings, consider leaving additional tolerance or performing a test cast first.
Practical Usage Tips
Mix Pure Mould silicone at a 1:1 ratio, ensuring even consistency. Pour gently to avoid air bubbles, and allow the silicone to cure undisturbed for at least 3 hours (preferably up to 8 hours, especially with larger volumes or lower temperatures). The Pure Mould silicone rubber is compatible with most resins and waxes typically used in casting and jewellery making.
When This Matters
Choosing the right silicone is especially vital for projects where detail accuracy, rapid turnaround, and repeated use are priorities—such as small wax patterns, prototype replicas, and complex 3D printed parts.
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Pure Mould silicone offers a dependable solution for a range of wax and resin casting needs. If you are planning on large or highly detailed casts, factoring in the minor shrinkage and proper mixing will help ensure a professional outcome. For more on timing and best practices, see our comprehensive guide on removing formwork for different materials.