In a message dated 13/04/2007 16:00:08 GMT Standard Time,
EuropaXSA276@aol.com writes:
I have been most interested in this product. The Aeropoxy rep at Sun N Fun
had told me the it was under testing by Europa as a replacement adhesive a
few years back.
I talked with Andy a year later, at Sun n Fun inquiring about the testing.
He replied that the product did not hold up to his expectations. Therefore it
was never "approved".
I most certainly would like to know more about the testing and what issues
were found. The 6228 has cost and accessibility benefits.
Perhaps Nev could fill us in on the subject?
Hi Brian et all,
The Aeropoxy adhesive is NOT suitable as a replacement for Redux / Araldite
420 in use on a Europa.
Tests I carried out way back when , back to back, with Aeropoxy and 420
showed the Aeropoxy to be far too brittle.
Lap joint test samples were made useing the pre preg laminates as in the
fuselage / wing skins, same materials / same sizes / same surface preparation
/
same cure cycle / with both adhesives. Did 10 of each from memory?
Didn't need to get them scientifically strain tested [ by Slingsby, which is
what we had done with various lay up resins] a simple blow with a hammer on
one end of the tab , with the other end clamped in a vice showed that the
Aeropoxy bonded ones let go every time, whereas the 420 bonded ones would take
one hell of a beating before eventually the pre preg would fail.[ Same hammer
! ]
The make up of the 420 includes rubber granules, so there is a fair amount
of '' give '' in the bond.
This is allways a good test to check if the 420 has '' time lifed ''. [ in
spite of the very conservative expiry date set by the manufacturer ] If the
bond fails, bin it, if the glass fails, it is still good.
I also tested a couple of other adhesives [ at different times ] against the
420, similar results.
If there had been a suitable replacement to 420, it would have been used in
the U.S.A. as we had a lot of hassle getting the 420 shipped over [ Dangerous
Goods and all that !]
Don't experiment and risk your life, just to save a few bucks ?
Cheers,
Nev.
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