Mixing Ratios for Synthetic Resins & Silicone

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Accurate mixing is essential for synthetic resins and silicone to cure correctly and perform as intended. If you’re unsure about measuring by weight or volume or which ratio to use, this guide will help you get it right.

Understanding Mixing Ratios: Volume vs. Weight

The most reliable way to know your resin or silicone mixing ratio is to check the manufacturer’s instructions. Some products, such as One-2-One Epoxy Resin, require a 1:1 ratio by volume, meaning equal amounts from both bottles measured in millilitres. Others, like certain fast-curing art resins, may specify a 2:1 or 3:2 ratio by weight, which means using scales for precise measurement. Never assume that all resins or silicones follow the same rule—always refer to the supplied guidance for that specific product.

Practical Tips for Mixing Resin and Silicone

Prepare tools: Use clean measuring cups (for volume) or precise digital scales (for weight).
Mix thoroughly: Resin and silicone need to be blended until the mixture is uniform, paying attention to scrape the sides and bottom of your container.
Avoid errors: Guesswork can lead to tacky, soft, or weak results, so double-check your amounts before pouring.

For beginners, products like the “Pure Mould” Translucent Silicone Rubber are user-friendly, requiring a simple 1:1 ratio by weight and curing at room temperature with minimal shrinkage.

When This Matters Most

If you’re working on detailed crafts, jewellery, or mould making, the right mixing ratio is crucial for clarity, strength, and finish. Products tailored for quick results, such as the ICreation Fast Epoxy Resin, have specific ratios to deliver rapid demoulding and a gloss finish—following their instructions ensures your project’s success.

Related guides

Taking the time to measure your synthetic resin or silicone correctly improves results and minimises wasted material. Whether you’re casting, moulding, or coating, always use the correct ratio for your chosen product. For more in-depth advice, return to our main resin working guide.