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Oven-hardenable PVC plastisol, "liquid polymer clay," is a complement to polymer clay that can be used as an adhesive to combine pieces, or to create various effects. Pigments, chalk pastel, and regular polymer clay can be added to make colored liquid clay. The liquid can also be poured into molds to produce cast parts. [citation needed]
Polymer clay is a modelling material that cures when heated from 129 to 135 °C (265 to 275 °F) for 15 minutes per 6 millimetres (1 ⁄ 4 in) of thickness, and does not significantly shrink or change shape during the process. Despite being called "clay", it generally contains no clay minerals.
FIMO was first a plastic modeling compound brought to the attention of German dollmaker Käthe Kruse in 1939 as a possible replacement for plastic compounds. It was not suitable for her doll factory use, and she turned it over to her daughter Sophie Rehbinder-Kruse, [3] who was known in the family as "Fifi" (hence FIMO, from Fifi's Modeling Compound).
The molds are commonly half-divided (like the hollowed chocolate Easter eggs with candy inside) and a release agent may be used to make removal of the hardened/set resin from the mold easier. The hardened resin casting is removed from the flexible mold and allowed to cool. A Baldwin 6-axle locomotive kit cast in resin in HO Scale
It involves metal molds that are filled with liquid plastisol. When the open mold cavities are filled, the mold is spun on a high speed centrifuge to force the liquid vinyl into the fine details on the interior of the mold. Then the metal mold is placed into a heating solution, usually an industrial salt heated to about 204 °C (400 °F).
They can be initially modeled in clay, most commonly polymer clay, by hand or, alternatively, they can be digitally designed using digital sculpting tools such as ZBrush, and 3D printed. The hardened clay or 3D printed body parts are used to form molds for multiple parts to be cast in synthetic polyurethane resin.
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