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Choosing the right silicone for making a mould can make all the difference to your results. The two main types—putty and liquid silicone—offer different advantages depending on your project’s complexity and your experience level.
Silicone Putty or Liquid Silicone: What’s the Difference?
Silicone putty is ideal for swift, hands-on projects and beginners. With a simple 1:1 mix ratio, such as found in “I–Gum” – Non-Toxic Silicone Putty for Mould Making, it’s quick to prepare and doesn’t require special equipment. Perfect for moulding items with straightforward shapes, this option is also valued for its non-toxic, odourless formula and ease of use without gloves.
Liquid silicone rubber, on the other hand, lends itself to detailed work—capturing fine features, undercuts, and intricate designs. For such needs, “Liquid Mould” Casting Liquid Silicone Rubber or “Pure Mould” Translucent Liquid Silicone Rubber are ideal. These bi-component liquids require accurate mixing and a bit more patience during pouring and curing, but provide precision and excellent mechanical properties.
Matching the Silicone to Your Project
When selecting silicone, consider the item you want to replicate and the casting material you’ll be using. Putty types like “I–Gum” are perfect for fast work with resins, waxes or cement and are forgiving if you prefer a hands-on approach. If your object is highly detailed, or you are casting small, complex items (such as jewellery, artistic statues, or 3D prints), choose a liquid silicone rubber with good flow and lower shrinkage like “Pure Mould”.
- For ease and speed: Putty silicone with a 1:1 ratio.
- For fine detail and repeated use: Liquid silicone, translucent or standard.
- For compatibility: Double check your casting material (resin, wax, cement, etc.) matches your silicone’s properties.
When This Matters Most
If your project involves delicate shapes, transparency to check for air bubbles, or requires frequent mould re-use, investing a little more time selecting the right type brings substantial benefits. Beginners may find putty more forgiving, while experienced crafters working on detailed pieces often opt for quality liquid silicone rubbers for optimal results.
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Making sure you choose the type of silicone that matches your project needs lays the foundation for successful mould making. For more ideas, techniques, and video guidance, return to our main How to Make a Silicone Rubber Mold Video hub.