[PSUBS-MAILIST] Compass Video

[Alan via Personal_Submersibles]

Sean,
interesting; they are not saying it is any more adhesive than normal
epoxy, but are touting its thermal properties. That makes me think
that standard epoxy would be OK if the electronics aren't drawing
much current. 
Alan

> On 14/06/2019, at 4:18 AM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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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