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Choosing the right mould is crucial for successful casting, whether you are working with epoxy or polyurethane resin. While both resin types can use similar mould materials, certain silicone rubbers provide the best results. Here is how to select the ideal moulds for each resin type.
Silicone Moulds: A Reliable Choice
Silicone rubber moulds are widely regarded as the gold standard for both epoxy and polyurethane resin casting. Their flexibility makes demoulding easy and preserves delicate details, which is important for intricate designs. Professional-grade products such as the “Liquid Mould” Casting Liquid Silicone Rubber offer excellent reproduction, durability and can be used with a variety of casting materials.
- Flexible and non-stick for easy removal
- Captures very fine details and undercuts
- Reusable and durable for multiple castings
Checking Compatibility with Your Resin
Though most silicone rubbers are generally compatible with both epoxy and polyurethane resins, it is always wise to confirm with the product supplier before starting. Some silicone formulations may react differently depending on the resin system. For example, platinum-based silicones like “Pure Mould” are well-suited for a wide range of resins including epoxy, polyurethane, and polyester, providing versatility for different projects.
Practical Tips for Successful Casting
To extend the life of your mould and ensure quality casts:
- Always mix resins and catalysts according to manufacturer instructions
- Allow moulds to cure fully before use
- Clean moulds gently without harsh solvents to maintain their surface
- Store silicone moulds flat, away from direct sunlight
For creative projects, read the specific care notes for decorated silicon moulds, such as the Silicone Hexagons Mould, which is ideal for epoxy resin decorative pieces.
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Related guides
Whether you are working with epoxy or polyurethane resin, selecting a compatible silicone mould is key to achieving excellent casting outcomes. For more detailed advice and supplies, explore our main guide on how to get soft resin to mold.