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Chockstone Forum - Gear Lust / Lost & Found
Rave About Your Rack Please do not post retail SPAM.
Topic
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Date |
User
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Sun damage to helmet |
15-Oct-2010 At 10:30:15 AM |
cruze
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Message |
On 15/10/2010 Dane wrote:
>Then I think you may need to imagine harder.
>The UV light breaks the interatomic bonds in the polymer, making it more
>brittle, and weaker...
>How long this takes is dependent on the polymer and the amount of exposure.
>but certainly I'd be expecting them to last ~10 years for a hard shell.
>A foam one on the other hand would be a lot shorter.
>
That is certainly what I thought for hard shell helmets and I would be surprised if the impact resistance of the shell would degenerate in 10 years of average use. On the other hand I would probably disagree with your foam estimate of being shorter - they tend to have a very thin outer layer which would probably reduce UV exposure to the foam by quite a bit whilst at the same time not having to perform any strengthening. |
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