[PSUBS-MAILIST] Compass Video

[Sean T. Stevenson via Personal_Submersibles]

My go-to compounds for exactly this application:

https://www.mgchemicals.com/products/potting-compounds/epoxy-potting-compounds/

Sean

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Thursday, June 13, 2019 7:27 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

> Alan,
> I have had good luck with epoxy for potting penetrators in metal fittings.  I have pressure tested well past 1,000 psi with good success.  Gamma and E3000 both have 20 pin penetrators using casting resin and were pressure tested above 1,000 psi.
> Having said that, I potted my new compass sensor with epoxy and the sensor has failed possibly.   I have not investigated completely yet.
> I would have concerns now about potting electronics in epoxy.  this is my first time potting electronics,   I would recommend buying electronic specific potting material and keep using casting resin or epoxy for power penetrators.
> Hank
>
> On Thursday, June 13, 2019, 6:20:21 AM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
> Jon,
> that was one of the most comprehensive "How to" videos I've seen.
> Have one of those compasses so will emulate that.
> I have reservations about epoxy sealing the wires though.
> I did a lot of experiments with glues & PVC wire jackets & found a lot of
> the glues disappointing. I found one product specifically for PVC boats
> that stood out.
> I have mentioned before that I potted a couple of wires for 1" in to a WD40
> filled housing & the WD40 just ran out between the epoxy & wire jacket
> without pressure.
> Under pressure I would guess that the PVC jacket would be more compressible
> than the  epoxy resin around it & would tear away from it, letting water in.
> Suggest epoxying the whole board both sides & the wires where they are
> soldered on, in case of water egress.
> I have strong reservations about the epoxy sticking to the PVC pipe also.
> I would be interested in others opinions on this as potting wires is
> something we are doing a lot of.
> Alan
>
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