A little late coming into this one, but Lloyd gives a good suggestion (as
he usually does). I have worked with both the acrylic gels and the urethane
gels and both work well for the purposes of sealing off connectors.  You
may have to give those gels more time to outgas their solvents as you might
get bubbles in the gel.  I don't think that will impact reliability, but I
don't have the data to prove that conclusively.  But it would certainly be
better than uncoated leads.  The other alternative would be to use a
gel-like adhesive to seal off the connectors, especially if you have an
adhesive application step earlier in the process.
---
*Douglas Pauls *| Principal Materials and Process Engr | Advanced
Operations Engineering

*COLLINS AEROSPACE*

400 Collins Road NE, MS 108-101, Cedar Rapids, IA  52498  USA

*Tel:* +1 319 295 2109 | *Mobile: *+1 319 431 3773

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On Tue, Jan 26, 2021 at 7:36 AM lduso - Diamond-MT.com <[log in to unmask]>
wrote:

> It's hard to beat physics. Any liquid that has the viscosity to flow where
> you want it to provide coverage, will also flow where you do not want it.
> Especially with an uncontrolled robot. It is why most coating specs do not
> require the leads of the connectors to be coated. One option is to use a
> gel material to coat the leads first before applying the low viscosity
> material. The gel will not flow into the connector and prevent the liquid
> from entering. If your robot does not have that capability, it can be
> applied by hand prior to the robot.
>
> Lloyd Duso
> Diamond-MT
> (814) 535-3505
>
> https://urldefense.com/v3/__http://www.Diamond-mt.com__;!!MvWE!Qjb1aqtu8ijfCOjyOfYkP01Xk9k75M4A5IWuAarlkr71cq8mWBQCB0cOS6lIavr9_Q$
>
>
> On Mon, Jan 25, 2021 at 11:26 AM Reyes, Angel LAM2 4429 <
> [log in to unmask]>
> wrote:
>
> > Hi all
> >
> > Any recommendation for conformal coating UV cure to be applied by robot
> on
> > SMT SW leads, we tried DYMAX EMAX 99003 but did not work material migrate
> > by capillarity inside SW and internal metal contact parts were electrical
> > isolated
> >
> > Angel Reyes
> > 619 661 4429
> >
>