I took the kids to the Science Museum in Canberra (Questacon) and one of the toys we brought back was a Home-Made High Bouncing Ball.

Now I did it with the kids and it was amazing. You pour the powder in the mould, hold it underwater for a minute. Dry it in the mould for two minutes and open the mould and let it dry.

The end result was like the high-bouncer balls we used to play with as kids. (Lots of fun).

My question is: What is the chemical reaction in a home-made high-bouncer ball? (I'd also love a picture I can show my kids - but that is not essential).

  • $\begingroup$ There is reaction between borax and glue which result into bouncing polymer. $\endgroup$
    – Freddy
    Sep 28, 2014 at 4:43
  • $\begingroup$ Have you got a reference for that? It would be great if you could expand it into an answer. $\endgroup$
    – hawkeye
    Sep 28, 2014 at 5:25

1 Answer 1


I have google it and got the link which explains the process but don't show the organic reactions(might be because they are complex)

This activity demonstrates an interesting chemical reaction, primarily between the borax and the glue. The borax acts as a “cross-linker” to the polymer molecules in the glue – basically it creates chains of molecules that stay together when you pick them up. The cornstarch helps to bind the molecules together so that they hold their shape better. - See more at: Sciencebob

  • $\begingroup$ I remember this from a summer camp years ago. They show the actual reaction here: rsc.org/Education/EiC/issues/2005_Jan/exhibition.asp It's basically the borate ion acting as a weak crosslinker between chains of polyvinyl alcohol. Starch changes its consistency a bit. If you omit it, it doesn't hold together very well and can break apart if you throw it too hard. $\endgroup$ Sep 28, 2014 at 7:55

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