Shrinky Dinks and other shrink plastic crafts are safe because the oven temperatures are low enough that toxins like dioxin are not released. Dioxins form at very high temperatures, typically above 700 degrees Fahrenheit.

What are Shrinky Dinks made out of?

Shrinky Dinks® consist of thin, flexible sheets of polystyrene, a common polymer. Prior to heating, the thin, flexible sheets can be colored and cut into shapes.

What can I use instead of Shrinky Dink paper?

Tin foil or parchment paper to line a cookie sheet for baking them on. If you wish to shrink these outside to avoid any fumes, a toaster oven you can use for crafts.