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Liquid silicone rubbers are a top choice for crafting highly detailed, reusable moulds for resins, plaster, wax, and more. Choosing the right silicone and applying the correct techniques is key for successful results.
Selecting the Right Silicone Rubber for Casting
For most small items or detailed models, using a quality liquid silicone rubber makes a significant difference. Products like “Pure Mould” – Translucent Liquid Silicone Rubber for Mould Making offer easy 1:1 mixing and high detail reproduction, perfect for replicating intricate shapes, jewellery, or 3D-printed pieces.
When casting items with fine details, consider the material’s shore hardness. Softer grades (lower shore) are better for flexible, detailed moulds, while higher shore values give more rigid forms. For detailed work, a 20 shore rubber is commonly recommended. Always check compatibility with your casting medium—epoxy, polyester, polyurethane, wax, or cement.
Practical Steps and Tips
- Measure and thoroughly mix the base and catalyst according to product instructions (usually 1:1 ratio for convenience).
- Pour the mixed silicone carefully over your master pattern to avoid air bubbles—using a pressure pot can further improve results for complex models.
- Allow the rubber to cure fully, typically between 3 to 12 hours depending on the product chosen.
- Once cured, gently release the mould without stretching delicate areas. Liquid silicones typically have low shrinkage, though there may be a slight reduction in volume, especially in larger pours.
When This Matters
Choosing the right liquid silicone rubber is vital when working with delicate models, small batch production, or when repeated accuracy is important. This applies particularly to jewellery, model replicas, prototypes, and crafts requiring crisp, precise details.
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Using the correct casting liquid silicone rubber ensures your moulds turn out resilient and true to the original. Explore more techniques and materials in our full guide on making a mould with silicone rubber.