Graham-

If it's just for vibe, you're probably better off applying an adhesive after
all other operations prior to chassis mounting.  3145 RTV is what we
generally use in those instances.  I'm not sure chip mount adhesives have
very good sheer strength anyway- if there's any flex induced at all during
vibe, I doubt it will buy you anything.  Previous posts are accurate in
terms of mixing paste and glue- the test guys will be making Graham voodoo
dolls.

Good luck!   Bill C

-----Original Message-----
From: Graham Collins [mailto:[log in to unmask]]
Sent: Friday, February 23, 2001 1:47 PM
To: [log in to unmask]
Subject: [TN] SMT adhesive


Good day TechNet!
I'm looking for recommendations today.  I need an adhesive that I can dot
dispense on circuit boards (Dispense head on a GSM-1) and cure in the same
oven profile as a solder paste reflow profile.  I've got a couple of parts
that need a bit of extra grip on the board (for vibration resistance).  The
parts are SMT paste attached, so the glue will have to cure at the same time
as the paste reflows.
We currently run Loctite 3609 for our glue requirements, but I'm not
comfortable running it through the higher temperatures of a reflow profile.

Can anyone recommend a suitable adhesive for this purpose?  If you are the
supplier please contact me direct, no SPAM to the TechNet please!

As always, Thanks!  And a good weekend to all.


regards

Graham Collins
Process Engineer, Litton Systems Canada, Atlantic Facility
(902) 873-2000 ext 6215

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