Casting Materials
Working with silicone molds means working with materials, and there are many options to choose from. Each material brings its own character, weight, and surface, shaping both the process and the final result.
There’s no single right choice. What matters is how a material supports the form you’re creating and whether it fits the intended use of the product. Practical considerations like availability and cost often play a role as well, influencing which materials feel like the right match.
One of the most rewarding parts of casting is the freedom to explore. Materials can be coloured, layered, or combined with aggregates to create surfaces that range from subtle and minimal to more expressive, terrazzo-like finishes. This flexibility makes it easy to adapt materials to different forms and design directions, and keeps the process open, playful, and enjoyable.
Silicone molds provide a stable foundation for this exploration, holding shape and detail while allowing materials to express their own qualities.
Materials and Compatibility
While platinum silicone is known for its durability and flexibility, not every casting material is an ideal match. Some materials are more abrasive, while others generate higher heat as they cure. Over time, these factors can affect the surface and lifespan of the mold.
Choosing materials with intention helps preserve the mold and supports more consistent results. Understanding these differences allows makers to work more confidently and avoid unnecessary wear.
What We Work With
In our own studio, we work most often with concrete and Jesmonite.
Concrete was one of the first materials we explored. We’re drawn to its honest, architectural presence and the subtle variation that appears from cast to cast. Over time, we’ve found Cement All to be a reliable choice for smaller forms when mixed with care. It captures detail well and produces strong, balanced pieces, while asking for a gentle approach and good mold care.
Alongside concrete, we work extensively with Jesmonite, specifically Jesmonite AC730. We choose this material for the texture it creates. AC730 gives a more raw, tactile surface that feels natural and grounded, rather than overly smooth or polished. That slightly imperfect, stone-like finish is something we value, as it brings depth and character to the final object.
Compared to traditional cement-based materials, Jesmonite is often seen as a more eco-conscious option. Its water-based system and lower environmental impact make it an appealing choice for makers who want to be mindful of materials while still achieving strong, durable results.
These are the materials we return to because they align with our process and the kind of objects we want to bring into the world.
Finding What Works for You
Every maker, space, and workflow is different. Materials respond differently depending on form, environment, and intended use, and what feels right will vary from one project to another.
Exploring materials thoughtfully allows each maker to develop a process that feels natural and sustainable, both creatively and practically.
Final Thoughts
Casting is a balance between material, form, and intention. The material you choose becomes part of the story of the object you create.
We believe that taking time to understand materials leads to more considered, lasting pieces. When the material and form work together, the result feels effortless and true to its purpose.
👉 Explore our silicone molds and begin shaping your own material journey.
