Making crazy Putty

Introduction– In science today we are going to use household items and make silly putty.
Hypothesis– How can our putty bounce? What causes it?

What you’ll need:
•2 cups (1 smaller than the other)
•Food colouring
•PVA glue
•Borax solution (ratio of about 1 Tbsp of borax to a cup of water)
Icy Pole stick for stirring

1.Fill the bottom of the larger container with PVA glue.
2.Add a few squirts of water and stir.
3.Add 2 or 3 drops of food colouring and stir.
4.Add a squirt of borax (possibly a bit more depending on how much PVA glue you used).
5.Stir the mixture up and put it into the smaller container. By now the mixture should be joining together, acting like putty, crazy putty!

What’s happening?
The putty is formed because of a chemical reaction. The borax is a chemical and reacts with the glue and water and creates the putty when stirred and mixed together.
The PVA glue you use is a type of polymer called polyvinyl acetate (PVA for short), while the borax is made of a chemical called sodium borate. When you combine the two in a water solution, the borax reacts with the glue molecules, joining them together into one giant molecule. This new compound is able to absorb large amounts of water, producing a putty like substance which you can squish in your hands or even bounce.

Was you putty easy to make? Did you putty bounce?


2 thoughts on “Making crazy Putty

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