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Industrial plasticine is based on wax and typically contains sulfur, which gives a characteristic smell to most artificial clays. The styled object can be used to create moulds. However, largely because sulfur interfered with some mould-making processes, especially if clay surfaces are unsealed surfaces and platinum-cure Room Temperature Vulcanization silicone was used, sulfur-free variants are now available; these are usually much lighter than sulfur-containing clays.
Two Sulfur-free variants of industrial clay are made by USA Manufacturer, Van Aken International.
If a negative mold is required, this data is sent to a milling machine.
Before a new car model is launched, a long period of creating the right design takes place. Even today, computer models are not sufficient to evaluate a design. Therefore 1:4 and then 1:1 models are built to get an impression of the final car. These models are created in clay, and usually consist of a wooden or iron frame which is covered with Styrofoam. Clay is smoothed over the foam. Modellers then use various tools and slicks to finalize the shape of the car, since changes are readily possible.
There are 3 main producers of industrial plasticine operating worldwide.
- Staedtler from Germany, which is also known for FIMO.
- Chavant, which was founded by the French chemist Claude Chavant and is now located in New Jersey, USA.
- Van Aken International was founded and is based in USA, and produces sulfur-free Plastalina and Protolina (Commonly known as the Klean Klay replacement)