what kind of plastic are shrinky-dinks made of
Shrinky Dinks The base material consists of thin, flexible polystyrene plastic (#6) sheets.[2] Prior to heating, the plastic sheets can be colored with felt-tip pens, acrylic paint, colored pencils, etc. and cut into shapes. However, oily or waxy substances (such as cheap colored pencils, crayons, or oil paint) are not suitable because they melt or burn in high heat. When heated with the Easy-Bake Oven, a conventional oven, or a heat gun, the plastic shrinks by about five-eighths and becomes thicker and more rigid, while retaining the colored design.