Casting Liquid Silicone Rubber for Epoxy Resin Moulds

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Casting Liquid Silicone Rubber – For Moulds, Bi-Component A + B

Bi-component casting liquid silicone rubber is one of the most reliable materials for crafting high-quality, detailed moulds suitable for epoxy resin projects. Its flexibility and ability to capture fine detail make it essential for anyone aiming for professional results in resin casting.

Why Choose Bi-Component Liquid Silicone Rubber?

Bi-component liquid silicone rubber consists of two parts that, when mixed, create a versatile, flexible mould material. Once cured, it reproduces intricate textures and undercuts, making it ideal for small objects, jewellery, and prototypes. It is compatible with resins, wax, soap, polymer pastes and more, meaning you can reuse the same mould for various projects. For especially complex or highly detailed work, products such as “Liquid Mould” – Casting Liquid Silicone Rubber excel at capturing the subtle details needed by artists and model-makers.

Basic Steps for Preparing Your Silicone Mould

Formwork Preparation: Secure a watertight container around your original model to hold the liquid silicone in place during pouring.
Mixing: Combine the two components of silicone rubber according to the manufacturer’s instructions—usually a specified weight or volume ratio.
Pouring: Slowly pour the mixed silicone over your model, ensuring all details are covered. Gentle pouring helps avoid air bubbles.
Curing: Allow the silicone to cure completely, typically for 10-12 hours, though some fast-curing types may require less time.
Demoulding: Carefully remove the mould from the model. If desired, use a pressure pot during curing for bubble-free results.

When This Approach Matters

Using bi-component liquid silicone rubber is particularly important when you need to replicate items with fine details or undercuts that would be difficult to demould from rigid materials. It’s also ideal for those needing multiple castings from a single mould while maintaining high surface quality.

Related guides

Which Types Of Moulds Are Best For Pouring Epoxy Resin And How Can I Prepare Them For The Pouring Process

Developing effective resin projects starts with the right moulds, and casting liquid silicone rubber sets the benchmark for quality and versatility. Explore additional tips and suitable products in our main guide on mould selection and preparation for epoxy resin.