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What is this Soft rubber toy ball material?

What is this Soft rubber toy ball material?

What is this Soft rubber toy ball material?

(OP)
I'm sure a lot of people have seen these types of sqishy, rubber toy balls floating around in the offices to "relieve stress" but I am looking for the actual type of material these things are made of, any ideas on what to spec out? The material seems like some sort of VERY squishy, non-slip silicone or latex.

http://store.yahoo.com/opg/hiveball.html

Thanks for any help!
Kevin
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RE: What is this Soft rubber toy ball material?

There are a few very simple test that you can perform to help you identify the material. The following link is a site that will provide guidance http://www.chymist.com/Polymer%20Identification.pdf

Please note that additives can interfere and give false readings of the results from these tests.

RE: What is this Soft rubber toy ball material?

I think these are made of polyurethane foam.  Good idea to ask the polymer experts though...

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