How Thick Should Silicone Mould Walls Be?

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Wall thickness is a crucial factor in creating strong and reliable silicone moulds for resin casting. Ensuring the right depth helps prevent deformation and increases the mould’s durability for multiple uses.

Recommended Thickness for Silicone Mould Walls

When making a silicone mould, it’s best to allow at least 10mm (1cm) of silicone around your model on all sides. This buffer gives the mould adequate strength, supporting both straightforward and intricate designs. For larger items or complex shapes, consider using slightly thicker walls to maintain mould stability during casting and demoulding.

Selecting the Right Silicone for Mould Making

Choosing a high-quality silicone can make all the difference in your finished mould. Products like “Pure Mould” translucent liquid silicone rubber offer excellent strength and minimal shrinkage. For projects with fine details or deep undercuts, opt for silicone rubbers designed specifically for resin casting to ensure both resilience and precision.

Caring for Your Moulds

• Avoid stretching or bending the moulds unnaturally, especially if your walls are at the minimum recommended thickness.
• Store moulds supported by their base to keep walls from sagging over time.
• If you intend to make several castings, verify that your chosen silicone is suitable for repeated use, as tougher, thicker walls will better withstand wear and tear.

When Wall Thickness Matters

The thickness of your silicone mould walls is especially important when casting large or heavy resin objects, or when intricate designs require extra support. Thin walls can lead to warping or tearing, so following best practices helps avoid disappointment and ensures your creations come out perfectly.

Related products

• "Pure Mould" – Translucent Liquid Silicone Rubber for Mould Making
• "Liquid Mould" – Casting Liquid Silicone Rubber, 5-40 Shores, Bi-Component A+B
• "I–Gum" – Non-Toxic Silicone Putty for Mould Making

Related guides

• How To Make Silicone Moulds For Resin

Getting the wall thickness right is a simple but vital step towards producing robust, long-lasting silicone moulds for resin. For more expert tips on mould making, visit our main How to Make Silicone Moulds for Resin guide.