Choosing the right RTV (Room Temperature Vulcanising) silicone rubber is essential for precise and reliable mould making, whether for creating resin jewellery, casting candles, or reproducing intricate models. On this page, you’ll find a practical comparison of the best RTV silicone rubbers for both professional and hobby use, highlighting key features so you can select the ideal product for your casting needs.

Comparison of RTV Silicone Rubbers

RTV silicone rubbers are available in several formats, each offering distinct advantages depending on your project requirements. The main differences are in curing speed, level of detail reproduction, ease of use, and safety features. For those seeking exceptional clarity and detail, “Pure Mould” – Translucent Liquid Silicone Rubber for Mould Making offers a platinum-based, fast-curing solution. If versatility across fine detail and larger projects is needed, bi-component options like “Liquid Mould” – Casting Liquid Silicone Rubber, 5-40 Shores, Bi-Component A+B and “Liquid Mould” – Casting Liquid Silicone Rubber, 15 Shores 20.8 kg are suitable. For hands-on crafts or one-off impressions, “I–Gum” – Non-Toxic Silicone Putty for Mould Making provides ease, non-toxicity, and rapid mixing without the need for gloves. Selecting the best RTV silicone comes down to balancing detail, durability, and the practicality of application.

Key Benefits of Top RTV Silicone Choices

Pure Mould stands out for its fast curing and visibility, offering a hassle-free process for detailed moulds. Liquid Mould variants deliver versatility and robust detail for intricate or repeated castings. I–Gum prioritises safety and hands-on ease, with no odour or need for gloves.

“Pure Mould” – Translucent Liquid Silicone Rubber for Mould Making

PLATINUM BASED TRANSLUCENT AND FAST CASTING LIQUID SILICONE RUBBER FOR MOULDS

“Pure Mould” is especially well-suited for users who require high detail and clarity. Its platinum-based, translucent formulation allows you to see through the mould during casting, making it invaluable when you wish to monitor resin flow or reduce defects. Curing rapidly in 3–8 hours, it saves time on production cycles and is compatible with a wide range of materials including epoxy, polyester, polyurethane resins, plaster, cement, and wax for candle making. This silicone rubber is certified non-toxic, solvent-free, and made in Italy—an excellent choice for both safety and reliability. Its 1:1 mixing ratio makes it user-friendly, and its advanced formula ensures extended service life and minimal shrinkage. Ideal where repeated casting is required and detail matters most. View details for “Pure Mould” – Translucent Liquid Silicone Rubber for Mould Making.

“Liquid Mould” RTV Silicone Rubbers – Bi-Component Systems

For broader versatility and value in detailed and durable mould creation, consider the “Liquid Mould” – Casting Liquid Silicone Rubber, 5-40 Shores, Bi-Component A+B and “Liquid Mould” – Casting Liquid Silicone Rubber, 15 Shores 20.8 kg. These bi-component (A+B) systems excel for small parts, jewellery, or functional technical moulds. They deliver strong mechanical properties, excellent flow for sharp detail, and work well with resins, soap, polymer pastes, and hot wax. Their ability to reproduce fine detail and handle undercuts means they’re suited for complex shapes or repeat casting. Add a catalyst before use and allow the typical curing time of around 10–12 hours. Both are cruelty free and vegan-friendly. Larger packages and varying Shore hardness options make these suitable for artisans and foundries alike.

“I–Gum” – Non-Toxic Silicone Putty for Mould Making

“I–GUM” – Non-Toxic Silicone Putty for mould makingis a unique, two-component putty offering a safer, odourless, and glove-free solution to mould making. Its long working time (around 20 minutes) and 1:1 mix ratio enable stress-free application, ideal for beginners or quick craft projects. It excels in making moulds for resin, polyurethane, wax, and cement with simple hand-mixing and without added release agents. European-made, cruelty free, and vegan-friendly, “I–Gum” is best for those who value safety, direct tactile manipulation, or moulds where brush-on systems are inconvenient.

Choosing the Right RTV Silicone for Your Application

Project requirements should always determine your silicone selection. For high-precision, repeated use, and monitoring of the casting process, the transparent “Pure Mould” is unmatched. If your work involves frequent casting of small, complex objects and flexibility across casting materials, opt for a “Liquid Mould” bi-component silicone. For fast, safe, and convenient use without chemicals or odours, “I–Gum” silicone putty is an outstanding craft choice. Matching your specific project, material compatibility, and level of experience with the correct silicone ensures optimal mould results.

Tips for Getting the Best from Your Silicone Rubber

Always measure mixing ratios precisely to avoid incomplete curing or surface imperfections. For longer mould life, store silicone rubbers in a cool, dry place and clean tools immediately after use. Choose the silicone based on technical and project requirements rather than price alone for consistently better results.