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Polymer clay is a sculptable material based on the polymer polyvinyl chloride (PVC). It usually contains no clay minerals, and is only called "clay" because its texture and working properties resemble those of mineral clay. more...

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It is sold in craft, hobby, and art stores, and is used by artists, hobbyists, and children.

Material

Polymer clays of all brands contain a basis of PVC and one or more of several kinds of liquid plasticizer. Pigments may be added to the translucent base create a variety of colors, along with small amounts of kaolin or white china clay or other opaquing agents where opacity is desired. Mica may also be added to simulate pearlescent and metallic effects.

History

Bakelite, an early plastic used in both practical and decorative applications, was extremely popular with designers and had an early form of polymer clay available in kits, but the phenol base of uncured Bakelite was flammable and these were discontinued. Modern polymer clays are based on a plastic modeling compound brought to the attention of German doll maker Kathe Kruse in the late 1930's as a possible replacement for plastics that had become difficult to obtain during the early days of World War II. It was not suitable for use in her doll factory, so Kruse turned it over to her daughter Maureen, who was known in the family as "Fifi". The formulation was later sold to Eberhardt Faber and marketed under the name "FIMO" (FIfi's MOdeling Compound) in honor of Maureen.

The history of polymer clay as an art medium is only decades long, unlike many media that have been around for centuries and have long traditions. This newness means that there is a great deal of innovation by users of polymer clay. Often, ideas are born by borrowing from the traditions of some other materials, such as metalworking (mokume-gane), ceramics, glass (millefiori, lampwork), paper, etc.

Properties

Original formulations of polymer clay remain soft until cured at relatively low temperatures, but air-dry polymer clays have recently been added to the market. Traditional polymer clay hardens by curing at temperatures created in a typical home oven (generally at 265 to 275 °F (129 to 135 °C), for 15 minutes per 1/4" (6 mm) of thickness), and does not shrink or change texture during the process. When properly conditioned and cured, most clays create items that will not break if dropped or normally stressed. Cured pieces may have additional layers or enhancements added and be re-cured with no ill effect. As long as the maximum curing temperature is not exceeded, there is no limit to the number of times a piece can be re-cured. After it has cured, the clay surface can be left as is, sanded and buffed, or finished with a water-based varnish.

Read more at Wikipedia.org