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Achieving an accurate mixing ratio is essential when working with silicone rubber for mould making. Proper measurement and mixing ensure your moulds cure evenly and last longer.
Choosing and Measuring Your Silicone Rubber
Silicone rubbers typically come in two parts—a base and a catalyst—that must be combined in a set ratio, most commonly 1:1 by weight or volume. For best accuracy, use digital scales rather than estimating by eye or using cups. Weighing ensures both parts are present in the correct amounts, reducing the risk of uncured or weak moulds. Always check your product’s instructions to confirm whether weight or volume measurement is recommended.
If you’re starting out, “Pure Mould” – Translucent Liquid Silicone Rubber for Mould Making offers a straightforward 1:1 mix ratio, making it easy to get consistent results.
Thorough Mixing for Reliable Results
Even with the perfect ratio, incomplete mixing can result in sticky patches or poor curing. After measuring, combine both parts in a clean container and stir slowly yet firmly, scraping the sides and bottom to incorporate all material. For best results, mix until the colour and consistency are perfectly uniform throughout. Take your time, as rushed or uneven stirring can leave unmixed spots that affect your finished mould.
When Accuracy Matters Most
- Detailed or thin-walled moulds need perfectly cured silicone for crisp impressions.
- Fast-curing products rely even more on precise ratios for proper set times and flexibility.
- Professional or repeated use moulds benefit from consistency to reduce failure rate and waste.
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By following the correct mixing ratios for your silicone rubber and prioritising accuracy at every step, you’ll achieve high-quality, durable moulds. For more silicone mould-making tips, visit our main guide: How to make pourable silicone rubber for moulds?