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Old 04-11-2012, 02:23 PM   #4
Trailrider200
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Joined: Nov 2010
Location: Exit 10A, RT 42
Oddometer: 300
I have never seen any testing of a 5 yr or older helmet proving that it doesn't provide protection anymore.
So all I conclude at this time is that they want to sell helmets.

styrofoam is listed as degrading in 1+ million yrs. The problem is that the numbers never suggest the mechanism of decomposition. There are several - heat, biochemical, mechanical, irradiation. In the case of styrofoam, that material is biologically inert (microorganisms have a hard time eating it) so a long decomposition time is expected. However it is subject to degradation when exposed to sunlight (UV radiation), thermal energy (the bonds break when it gets hot enough), mechanical degradation (it erodes and wears away) and chemical attack (it burns). Under these conditions the decomposition time is much shorter.
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