Use this tag for questions about thermoplastics.
Thermoplastics are plastics that become soft and pliable when heated, and return to a stiff state after cooling. They are typically sold in sheets or pellets, and are often reusable. Many varieties are also biodegradable.
They are commonly used in costume design, but have a large variety of other uses as well, including mold making, vacuum forming, prototyping, and many others.
Popular brands available at art supply outlets include Thibra, Worbla, and Amaco. Other types of thermoplastics are available from a variety of sources.