Styro Foam Shrinkies

When Styrofoam is heated in the oven it will shrink a little and become hard like a plastic.

Styro Foam Shrinkies

What you need

Clean styrofoam trays
Acrylic paint


Put your oven at about 170 degrees and increase the temperature (if no shrinkage is occurring) until it begins to start shrinking.

Paint your design with the paint on to the styro. Then cut out the ornament shape to the size you want.

If you are going to be hanging it then now is the time to place a small hole in the top before you shrink it.

Place the styro onto a oven tray and then stick it in the oven.

The shrinkage time will be based on the size of the piece and the heat of your oven.

These can be used for gift tags, name tags, necklace charms and heaps more.

This Project should be supervised at ALL times and only done in a well ventilated area.

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  1. use #6 plastic instead of Stryrofoam

  2. I wanted to use this project for the Girl Scouts. Unfortunately I know when styrofoam is burned/cooked it releases a carcinogenic (cancerous) gas called benzene. sorry girls;
    we’ll use the real shrinky dinks.

  3. Hmmm…does not sound like a wonderful idea when it comes to heating up styro foam. I think I will just stick with using shrink dinks and keep my brain cells

  4. this project sounds like so much fun to make . can’t wait to try it.


  6. Absolutely crazy to be telling people to heat styrofoam! It will emit very toxic fumes! Toxic to you and your children!! This should be removed from this site.

  7. This was a fun project. Was hoping for tree ornaments and got bracelet charms.Who would of thought.

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