How is Liquid Silicone Rubber Prepared for Mould Making?

Step-by-Step Preparation

Begin by reading the manufacturer’s instructions provided with your silicone rubber kit—these often specify the exact mixing ratio (commonly 1:1 by weight or volume for two-part systems like “Pure Mould” – Translucent Liquid Silicone Rubber for Mould Making). Carefully weigh or measure both components (A and B), then mix thoroughly, scraping the sides and bottom to avoid unmixed sections. Pour the mixed silicone slowly and steadily over your prepared model or formwork, ideally allowing the silicone to flow from one spot to minimise air bubbles. Let the mixture cure for the recommended time—anywhere from 3 to 12 hours depending on the specific product.

Tips for Best Results

• Ensure your model is dry, clean, and free of any oil or dust before pouring the silicone. This helps the mould release easily and captures fine details.
• If you’re casting objects with intricate features or undercuts, consider tapping the container lightly after pouring to bring bubbles to the surface, or use a pressure pot if available.
• Work at room temperature for the most consistent results, as humidity and temperature can affect curing.

When This Matters

Thorough preparation is particularly important for projects where fine detail or reusability is required, such as jewellery-model moulds or repeated production of resin pieces. Correct measuring, mixing, and curing help ensure the finished mould is robust and long-lasting.