What is the safest mixing ratio for silicone rubber?

Typical Safe Mixing Ratios

For most home silicone rubbers, the safest and easiest ratio is 1:1 – equal parts of each component by weight or volume. This applies to both liquid types and putty systems. Always refer to your product instructions, as a few specialist options might differ, but 1:1 is by far the most common for hobbyist use.

Why Ratios Matter & Practical Tips

Accurate mixing ensures full curing, good mould strength and minimal shrinkage. Using digital kitchen scales is best for liquids, while putties can often be measured visually. Mix until uniform in colour and texture for the chosen product. If in doubt, products such as “Pure Mould” – Translucent Liquid Silicone Rubber for Mould Making are specifically designed for safe and straightforward 1:1 mixing at home.

When This Matters Most

• When using silicone for detailed moulds where failures are costly
• If you’re new to mould making and want consistent results
• When working with fast-curing silicone where timing and accuracy are key