Is RTV Silicone Rubber Safe for Mould Making?

What Makes RTV Silicone Safe?

Modern RTV (room-temperature vulcanising) silicone rubbers designed for mould making are typically solvent-free, odourless, and certified non-toxic. These features make them safe for use in a variety of environments, including hobby and professional workshops. Products such as “Pure Mould” – Translucent Liquid Silicone Rubber for Mould Making are specifically formulated to be easy to handle, safe to use without strong fumes, and suitable for everyday crafting needs.

How to Choose the Right Safe Silicone

When selecting a silicone for your project, look for products that are clearly marked non-toxic and solvent-free. A reliable mixing ratio (such as 1:1) makes handling simpler and safer. Transparent silicone types can be beneficial for detailed castings, as they allow you to observe the process. Whether you choose a liquid pourable rubber or a putty, always follow the manufacturer’s directions for mixing and curing to ensure safety and the best results.

• Check product descriptions for non-toxic and solvent-free claims
• Ensure compatibility with your chosen casting mediums (resin, wax, plaster, etc.)
• Avoid using in food or medical applications unless specifically certified for those uses

When Safety Matters Most

Opting for a certified non-toxic RTV silicone rubber matters most when you are working in smaller, less ventilated spaces or sharing your workspace with others. For repeated handling—such as in hobby workshops or educational settings—selecting products with clear safety credentials, like “I–Gum” Non-Toxic Silicone Putty, provides added peace of mind.