Liquid Silicone Rubber: A Practical Guide for Mould Making

What is Liquid Silicone Rubber?

Liquid silicone rubber is a two-part compound that, when mixed, becomes a flexible but strong silicone suitable for detailed moulds. Featuring easy mixing ratios—often 1:1—it enables both professionals and hobbyists to achieve crisp reproduction of fine details and even challenging undercuts in their castings.

This material works well for projects requiring intricate moulds, such as jewellery, resin figures, soap, and candle moulds. Its bi-component nature helps ensure a manageable working time and reliable results.

How to Use Liquid Silicone Rubber for Mould Making

Using liquid silicone rubber typically involves preparing your master model, setting up a formwork, combining parts A and B as directed, and carefully pouring the silicone to fully surround the object. After mixing, the cure time may range from 3-12 hours depending on the product, so patience is key. Some variants are fast curing (3–8 hours), such as “Pure Mould” silicone rubber, which streamlines the process for detailed and repeatable mould creation.

• Always measure components precisely for consistent results.
• Mix gently to minimise air bubbles; consider a pressure pot for even greater clarity.
• Choose a product suitable for your casting material—for example, certain silicones are ideal for hot wax, while others suit resin or plaster.

When Liquid Silicone Rubber Matters

Choosing liquid silicone rubber is essential whenever high detail, flexibility, and reliable release from the mould are important. It’s especially useful for artistic projects, small production runs, complex shapes, and delicate prototypes that demand precision and repeatability.