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    I asked the original question about fuel tank foam and I appreciate the
response.  I have since e-mailed the Crest Corp who produces reticulated
polyurethane ether-based foam with some common questions about fuel
contamination, replacement and life time, here is their response:

"This material is designed for use primarily in  military aircraft fuel
tanks.  It has demonstrated a life span at minimum of 12 years and still
testing'
however, these tanks are accessible & drainable & yours is not.
Also, the foam is most effective in preventing explosion after penetration
of the fuel tank by projectiles.  It does help mitigate fuel spray when
there is an impact rupture, but it
will not prevent it, nor will it keep the fuel from combusting when it is
met by a flame source.
Since you have so many concerns going in, it might be best if you did not
use this material.

Sincerely,
Crest Foam Industries"

That does it for me with poly foam however, the Explosafe aluminum baffles
are a different story.  I've heard good results from you on this list and
I'd like to hear more opinions about whether this is worth the trouble.  I
plan to fly a lot of IFR and I'm concerned about the combination of
fiberglass, lightning and near empty fuel tanks, in addition to crash
worthness.
Thanks, Jerry Lunceford


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