Hi, All,
I'm still trying to reconcile all the continued use of silicon adhesives
(as recommended by several learned members of this forum) with all the
learned discussion about how terrible it is to put silicon anywhere near
boards because of contamination issues. Is anyone prepared to put his/her
neck on the line and try for a definitive statement on this issue - is
silicon on boards good, OK or bad? If it's bad, why are so many still doing
it? Is it Force Majeur, are there no alternatives, or is there a mysterious
land out there where the use of silicon is not detrimental and the benefits
are worth having? Which land is this?
Peter
Phil Nutting
<PNutting@KAISERSY To: [log in to unmask]
STEMS.COM> cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST
Sent by: TechNet Aero/ST Group)
<[log in to unmask]> Subject: Re: [TN] Adhesive Recommendations?
02/13/02 09:14 PM
Please respond to
"TechNet E-Mail
Forum."; Please
respond to Phil
Nutting
Rick,
Way back in the very early seventies when I was working on research
payloads for rockets we used (Dow Corning? GE?) 3140 and 3144 RTV. Now
thirty years later we use Dow Corning RTV 737. It has good electrical
characteristics, good moisture resistance and sticks like crazy. We buy it
in 3 oz. tubes and 10.1 oz "caulking cartridges". For ease of dispensing
we transfer from the 10.1 oz cartridge into 30cc syringes and then use
0.063" tip for fine application dispensing. The dispenser is air operated
and the assemblers love it after having to fight with the half empty "tub
caulk" size tube for years.
For instant gratification there are several clear RTV products available at
the local hardware store that are used for general bonding and sealing.
Like replacing those tiles in the bathroom that have come loose.
It isn't high tech but it has worked for many years.
Phil Nutting
-----Original Message-----
From: Rick Thompson [mailto:[log in to unmask]]
Sent: Tuesday, February 12, 2002 5:14 PM
To: [log in to unmask]
Subject: [TN] Adhesive Recommendations?
We have an application where we need to secure some vertically mounted
radial electrolytic caps and a few other higher profile items to make
them resistant to shock, impact and vibration (amusement park
application). I've contacted Loctite and 3M for recommendations but the
ones I've gotten have several week lead times, minimum buys due to
special order, etc. Since we don't know if the products will work, we
didn't want to buy minimum quantities of materials we can't return.
Does anyone have any recommendations for standard products you may have
used in similar situations? I realize I can get samples from the mfgs.
Noted but I was hoping to shorten the lead time if I can find off the
shelf products that may do the job.
Thanks for your inputs.
Rick Thompson
Ventura Electronics Assembly
2655 Park Center Dr.
Simi Valley, CA 93065
+1 (805) 584-9858 x-304 voice
+1 (805) 584-1529 fax
[log in to unmask]
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