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If you’re starting out with resin casting or model mould making, you may wonder what sets platinum-based silicone apart from standard casting silicone rubber. This guide explores the main differences, helping you choose the best material for your projects.
How Platinum-Based Silicone Differs
Platinum-based silicone, sometimes called addition-cure silicone, is valued for its purity and precision. Compared to regular condensation-cure silicones, it generally shows less shrinkage and delivers cleaner, highly detailed moulds. These features are especially important for demanding tasks such as professional model making or when multiple reproductions are needed.
Regular casting silicones perform well for general uses, but may exhibit more shrinkage as they cure and can be less durable over repeated use. Platinum-cure variants, such as “Pure Mould” translucent liquid silicone, maintain consistent shape and flexibility even after many castings.
Choosing the Right Silicone for Your Project
When fine surface detail and dimensional accuracy are crucial, platinum-based silicone is highly recommended. Its translucency also makes alignment easier during the moulding process. Hobbyists and professionals alike often reach for it when working with epoxy, polyester, polyurethanes, and acrylic resins, as well as plaster and concrete.
For most custom moulds and occasional use, standard casting silicones (like those found in bi-component systems or putty form) offer convenience and economy. Products such as non-toxic putties provide a simple option for quick custom forms.
When These Differences Matter
- For repeated use: Platinum-cure silicone stands out for its long-lasting flexibility and resistance to degradation.
- For intricate detail: If your design demands replication of fine textures and undercuts, a platinum-based material will reduce the risk of lost detail or excessive mould wear.
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Understanding the advantages of platinum-based versus conventional casting silicones will help you select the most suitable mould material for your needs. For even more guidance and specific recommendations on which silicone type to use, visit our main guide on what type of silicone rubber is used.