Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Capacitor securing

jdumont

#34470

Capacitor securing | 25 May, 2005

What is everyone using to secure their caps on products that go through ESS testing. We have been using Dow 3140 RTV but it takes too long to dry and I read that RTV isnt the best anyhow. Any suggestions...

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#34471

Capacitor securing | 25 May, 2005

Look here, while you're waiting for others to reply: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=33826

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URL

#34472

Capacitor securing | 25 May, 2005

Hot melt from a glue gun. Works well but a pain if the part has to be replaced.

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jdumont

#34473

Capacitor securing | 25 May, 2005

Yea that was my post from a while back. Never really got any good answers though. Let me know if anyone knows of anything.

Thanks in advance... JD

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Dave G

#34474

Capacitor securing | 25 May, 2005

3M jetmelt. A bit better than off the shelf reg hotmelt. Also use a GE white RTV. Never had any caps come off the board with either.

DG

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URL

#34475

Capacitor securing | 25 May, 2005

Hi Dave,

How/why is the 3M better? Sounds like you did some research and was wondering if reg. ol' hot melt might cause some other problems to the board. I bet the 3M costs a bit more too.

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jdumont

#34478

Capacitor securing | 25 May, 2005

So it looks like 3M Jetmelt 3748 and 3779 would be suitable for what i need. Were either of these the ones you were refering to?

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Dave G

#34515

Capacitor securing | 26 May, 2005

We use the 3748. We picked it many moons ago after doing product HALT & HASS testing. Basically the run of the mill hotmelts didn't hold up as well under the conditions our equipment lives in. (We do a lot of MIL,Aero & Industrial motor/actuator drive & control stuff - lots of vibration & pretty severe temp swings) This kind of stuff all has to be qualified for most of our customers so we have to be specific about what we use. We also use some two part epoxy type adhesives for a lot of the MIL stuff. (Master Bond -big $$)

DG

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jdumont

#34587

Capacitor securing | 27 May, 2005

Looking at the data for the 3748 material it says its only heat resistent to 79 C. Im going to go with the 3779 instead because of the higher temp rating (149C). Thanks JD

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