<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>Here's a good article on bonding epoxy to PVC pipe, showing</div><div>varying methods & their test results.</div><div><a href="https://www.epoxyworks.com/index.php/bonding-pvc-plastic-with-epoxy/">https://www.epoxyworks.com/index.php/bonding-pvc-plastic-with-epoxy/</a></div><div>They use a West Systems epoxy but recommend another product. </div><div>Alan</div><div><br></div><div><br>On 14/06/2019, at 7:16 AM, Sean T. Stevenson via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div>These potting compounds are a bit more compliant when cured compared to e.g. a typical marine two part epoxy - particularly the 832FX product. Anything too rigid will have a tendency to break adhesion under strain or thermal shock. Conversely, too soft and it won't hold the pressure, depending on bulk thickness. MG also makes polyurethanes, but I haven't used them personally.<br><br>Sean <br><br><br>-------- Original Message --------<br>On Jun 13, 2019, 12:52, Alan via Personal_Submersibles < <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<blockquote class="protonmail_quote"><br><meta http-equiv="content-type" content="text/html; charset=utf-8"><div></div><div>Sean,</div><div>interesting; they are not saying it is any more adhesive than normal</div><div>epoxy, but are touting its thermal properties. That makes me think</div><div>that standard epoxy would be OK if the electronics aren't drawing</div><div>much current. </div><div>Alan</div><div><br>On 14/06/2019, at 4:18 AM, Sean T. Stevenson via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div>My go-to compounds for exactly this application:<br></div><div><br></div><div><a href="https://www.mgchemicals.com/products/potting-compounds/epoxy-potting-compounds/">https://www.mgchemicals.com/products/potting-compounds/epoxy-potting-compounds/</a><br></div><div><br></div><div>Sean<br></div><div><br></div><div class="protonmail_signature_block protonmail_signature_block-empty"><div class="protonmail_signature_block-user protonmail_signature_block-empty"><br></div><div class="protonmail_signature_block-proton protonmail_signature_block-empty"><br></div></div><div><br></div><div>‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐<br></div><div> On Thursday, June 13, 2019 7:27 AM, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></div><div> <br></div><blockquote class="protonmail_quote" type="cite"><div style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif; font-size: 13px;"><div><br></div><div>Alan,<br></div><div>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. <br></div><div>Having said that, I potted my new compass sensor with epoxy and the sensor has failed possibly. I have not investigated completely yet. <br></div><div>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.<br></div><div>Hank<br></div><div><br></div></div><div class="yahoo_quoted"><div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;"><div>On Thursday, June 13, 2019, 6:20:21 AM MDT, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></div><div><br></div><div><br></div><div><div dir="ltr">Jon,<br></div><div dir="ltr">that was one of the most comprehensive "How to" videos I've seen.<br></div><div dir="ltr">Have one of those compasses so will emulate that.<br></div><div dir="ltr">I have reservations about epoxy sealing the wires though.<br></div><div dir="ltr">I did a lot of experiments with glues & PVC wire jackets & found a lot of<br></div><div dir="ltr">the glues disappointing. I found one product specifically for PVC boats<br></div><div dir="ltr">that stood out.<br></div><div dir="ltr">I have mentioned before that I potted a couple of wires for 1" in to a WD40<br></div><div dir="ltr">filled housing & the WD40 just ran out between the epoxy & wire jacket<br></div><div dir="ltr">without pressure. <br></div><div dir="ltr">Under pressure I would guess that the PVC jacket would be more compressible<br></div><div dir="ltr">than the epoxy resin around it & would tear away from it, letting water in.<br></div><div dir="ltr">Suggest epoxying the whole board both sides & the wires where they are <br></div><div dir="ltr">soldered on, in case of water egress.<br></div><div dir="ltr">I have strong reservations about the epoxy sticking to the PVC pipe also.<br></div><div dir="ltr">I would be interested in others opinions on this as potting wires is <br></div><div dir="ltr">something we are doing a lot of.<br></div><div dir="ltr">Alan<br></div><div dir="ltr"><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">Personal_Submersibles mailing list<br></div><div dir="ltr"><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr"><a target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div></div></div></div></blockquote><div><br></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></blockquote></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></body></html>