Are These Silicones Compatible With All Casting Materials?

Compatible Casting Materials

Modern silicone rubbers for mould making are generally suitable for popular casting materials such as epoxy resin, polyester, polyurethane, wax (including hot wax for candle making), plaster, and cement. Their flexibility and detail-replicating properties make them especially suited to projects requiring fine features and sharp undercuts.

• Resins (epoxy, polyester, polyurethane, acrylic)
• Plaster and cement
• Wax (natural and synthetic)
• Soap and polymer pastes

For example, “Pure Mould” Silicone Rubber offers broad compatibility, making it a good choice for various applications.

Choosing the Right Silicone for Your Casting

While most silicones are compatible with common casting materials, it’s essential to check each product’s details before starting a project. Some silicones are formulated for specific uses, such as capturing extremely fine details in small models or handling higher temperatures in hot wax applications. Always consider the curing time, mixing ratio, and any recommendations regarding shrinkage or resistance, especially for repeated or professional use. Bi-component silicones and non-toxic putties, like those found in the “Liquid Mould” and “I–Gum” product lines, each suit different moulding techniques and project scales.

When Material Compatibility Matters

Ensuring your silicone mould rubber matches your chosen casting medium is crucial for achieving crisp detail, preventing adhesion problems, or unwanted reactions. This is especially relevant if you’re casting large pieces, using heat, or making multiple reproductions. If your project involves less common materials or requires specific certifications, always consult the product datasheet or seek advice to confirm compatibility before proceeding.