Sender: <marv@lancaironline.net> (Marvin Kaye)
To: lml@lancaironline.net
Date: Thu, 22 Jan 2004 13:46:26 -0500
Message-ID: <redirect-2944183@logan.com>
Reply-To: "Dan Schaefer" <dfs155@earthlink.net>
From: "Dan Schaefer" <dfs155@earthlink.net>
Subject: Re: Bonding Plexiglas
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Scott Krueger wrote:

"My glass is "bonded" in with the 3M structural adhesive supplied with my
1989 kit (I don't remember the type)....."

That was 3M 3316, Scott. (Can't for the life of me know why I remember that,
at my age, one usually has trouble remembering whether I've had one beer or
four)!

It came with the early kits and was used for all structural bonding and
is/was (don't know if it's still available) pretty tough. I did some coupon
testing early on to get some idea of the peel and shear strength of 3316 and
was quite impressed - in pull-tests (for shear) the glass coupon would break
before the lap joint (1 inch over-lap) would fail, and peel test showed it
to be quite superior to the Saf-t-Poxy we used in those days for wet
lay-ups. A plus for the stuff (IMHO) is that it remained slightly flexible
(when completely cured, you could get a slight indentation in a squeeze-out
bead by pressing hard with your thumbnail) rather than brittle, as some
lay-up epoxies become.

After 10 + years, it remains that way.

Dan Schaefer