Re: ATM Sticking Together

[atm@misterg.fsnet.co.uk (Andy Gray)]

On Sun, 4 May 2003 23:19:03 -0700,  "Mel Bartels"
<mbartels@efn.org> wrote:


>Are there any modern adhesives that match particular coefficient of
>expansions with commonly used glass (plate, pyrex, whatever), that if used
>with precision ground surfaces to mate, would result in a bond that would
>not distort the glass and that could survive aluminizing and the vagaries of
>time?
>

Anything wrong with epoxy?

It's vacuum compatible (I believe some can even be vacuum
baked to a limited extent); can be flowed into joints if the
work is warmed, and is available in flexible versions if
there are any concerns about differential expansion.

It goes without saying that the joints should be close
fitting and extremely well prepared - it should be possible
to get a glue line a few 10s of microns. If this is
achieved, the thermal and mechanical effects must be tiny,
mustn't they?

Apologies if I'm going over old ground.

We used to mark glass with an epoxy based ink (Dexter Hysol)
that had a liquid primer based on some sort of silane
compound.

Have a browse around:

http://www.henkel.com/int_henkel/loctite_epoxy/index.cfm?&pageid=158&layout=2

for more types of epoxy than you ever knew you needed.

Andy

(Still wrestling with a 1.5" diagonal flat)

Andy Gray, N. Wales, UK.