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GBlist: Silicone caulk

I am trying to figure out what the best material is to seal air leaks in
solar wall collectors.  Because of high heat, silicone caulk is recommended
in most literature I have looked at.  Does anyone know about the toxicity of
this (especially when exposed to temperatures above 200 deg F)? I know that
it smells funny when freshly applied.  Does this smell indicate toxicity?

Thanks for your help!

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