REFLECTOR: Wing Delamination question

[Jeffrey Clough]

May be true...dunno.....but there was a thread a few years ago that said
that our epoxy WOULD eat/soften blue foam (IT DOES HAVE STYRENE in
it...wouldn't that cause some melt possibilities?)...therefore ONE of
the reasons to mix a slurry (and one of the reasons some advocated hard
shelling before applying fiberglass) was to avoid potential
softening/melting of the blue foam........
Jeff Clough

Richard Riley wrote:

> At 04:22 PM 3/5/2006, you wrote:
>
>> And by the way, I wouldn't use pure epoxy (no micro) since it can
>> melt the foam if for some reason the delam pulled the slurry up from
>> the foam.
>
>
> Look, I don't want to be impolite since I'm a guest here, but I can't
> let that go by.
>
> Epoxy will NOT chemically melt any of the foams used in these
> aircraft.  If you got an exotherm the heat could damage foam, but that
> has nothing to do with the old micro-slurry on the foam.
>
> There are several kinds of foam you might see.  Blue foam is
> Polystyrene.  It can be melted by a wide variety of solvents (lacquer
> thinner, styrene) and by polyester or vinylester resin - the kind of
> "fiberglass resin" used in surfboards, boats and Glasairs.  It is NOT
> attacked by epoxy.
>
> The other foams - Urethane (like Last-a-foam) is just about inert. 
> PVC foams are - chemically speaking - a hybrid of PVC and Urethane. 
> Polymethacrylimide, like Rhoacell, has great temperature range. 
> Styrene acrylonitrile (SAN) acts like cross linked PVC.  None are
> affected by either epoxy or polyester resin.
>
>
>
>
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