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Bi-component liquid silicone rubber, designed for use with an added catalyst, is ideal for making flexible, detailed moulds for a wide range of creative and technical applications. Here’s how to work with these products from mixing to casting.
What Is Bi-Component Silicone Rubber?
This type of silicone consists of two parts—base and catalyst—which must be combined just before use. Once mixed, the curing process begins, resulting in a flexible material able to capture intricate details and undercuts for use in mould making, crafts, technical components, and more.
How to Mix and Use
Following the manufacturer’s recommended ratio is crucial. Most bi-component silicones require a 1:1 mix of base and catalyst, but always check the instructions. Pour both parts into a clean container and stir thoroughly, taking care to avoid introducing too many air bubbles. Once mixed, pour or apply the silicone over your prepared model. Curing times vary, but expect full set in a few hours at room temperature, as with the “Liquid Mould” – Casting Liquid Silicone Rubber which cures in several hours. For best results, work within the product’s recommended working time and ambient conditions.
Tips for Best Results
- Prepare your model and mould box cleanly and securely to prevent leaks.
- Mix with steady movements to minimise trapped air.
- For complex shapes, consider gently tapping the container or using a pressure pot to reduce air bubbles.
- Allow the mould enough time to cure fully before demoulding to avoid tearing or distortion.
When This Matters
Choosing bi-component silicone rubber is important when you need precision and flexibility, such as when moulding small models, jewellery, detailed ornaments, or technical pieces. The catalyst system ensures reliability for those aiming to produce multiple castings from one mould.
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Mastering bi-component liquid silicone rubber empowers makers to create robust and finely detailed moulds, making the most of every kilogram. For wider project ideas and advice on how to utilise silicone rubber, explore our main guide on what do I do with 1kg of silicone rubber?.