How Long Does Silicone Rubber Take to Set?

← Back to How to create liquid silicone rubber?

Understanding how long silicone rubber takes to set is essential for anyone making moulds or casting items. The set time can vary depending on the silicone type and the working environment.

Typical Silicone Rubber Setting Times

Liquid silicone rubber usually cures within 3 to 12 hours. Products such as “Pure Mould” Translucent Liquid Silicone Rubber may fully set in just 3–8 hours, while more robust or thicker mixes could require up to 12 hours or more. Always consult the product instructions for exact curing durations.

Quick-Setting Formula: 3–8 hours
Standard Setting: 8–12 hours

Factors That Affect Curing

Several factors have an impact on curing times. Higher ambient temperatures generally speed up the process, while cooler conditions can slow it down. The amount of catalyst mixed in and the size or thickness of your mould will also influence how quickly the material sets. Ensure good ventilation and stable room temperature for optimal results.

Practical Tips for Mould Makers

For best results, plan your working time and allow the silicone rubber to cure undisturbed. Avoid demoulding early, as it can deform the final shape. If working with detailed or deeper moulds, consider using a pressure pot for air bubble removal and give extra time for the silicone to solidify thoroughly.

Choose a product that matches your schedule and project needs. For swift projects, opt for a fast-curing silicone like “Pure Mould”; for intricate or thicker casts, a traditional slower set may offer greater flexibility.

When This Matters

Knowing the set time for silicone rubber is crucial when planning craft, model making, or batch production projects. It helps ensure your working process is efficient and your results are consistent.

Related guides

How To Create Liquid Silicone Rubber

Accurate knowledge of silicone rubber setting times helps achieve precise, clean moulds and enhances your success when creating with liquid silicone. For a complete guide to starting your next project, see our main article on how to create liquid silicone rubber.