[PSUBS-MAILIST] potting epoxy

[Alan James via Personal_Submersibles]

Brian,before you do your electrical through hulls, have a look at this video of Doug'sif you haven't already. He had lots of failures, with leaks, & pins extruding out ofthe epoxy. The solution in the end was to rough up the pins first before epoxying& coating with 3M 5200.AlanROV Hull Components - Part 3 - Through Hull Electrical Connectors

  
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ROV Hull Components - Part 3 - Through Hull Electrical Connectors
 Starting to make some progress on our DIY high pressure through hull connectors, but this is an area that needs ...  |   |

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      From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Saturday, March 11, 2017 4:06 PM
 Subject: Re: [PSUBS-MAILIST] potting epoxy
   
Alan,   you might be able to use some of that high temp epoxy for the high temp area of your lights. Brian

--- personal_submersibles at psubs.org wrote:

From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] potting epoxy
Date: Sat, 11 Mar 2017 14:30:40 +1300

Brian,just had a look at the link to the potting epoxy.Make sure you buy the SS (slow setting) version for larger volume casts.The other versions seem designed for pouring over wiring & I can't see anyreference as to how thick you can pour it. Most of that sort of stuff can crack if you pour it too thick & cure it too fast.I used to use resins in art work & have had a number of thick sectioned pours crack.If you have already bought the other product; you could use it by doing aninitial pour or brush on, around the wires or pins & when dry, fill in with theSS stuff.Cheers Alan 

Sent from my iPad
On 10/03/2017, at 6:48 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


Hi All,             I got some potting epoxy from McMaster Carr,  problem is, it's not really the best solution for our needs since it is actually a flexible epoxy, it would most likely extrude under pressure.  Luckily in the package with the epoxy that I got,  they sent me a lot of info and a catalogue showing all their epoxy products.   They have some amazing epoxies !  Ceramic, machine-able epoxy, and the perfect epoxy for what I need, which is: potting for my electrical penetrators.  This stuff (Duralco 4461 IP)  is really great because it's very pourable and it has a heat tolerance of 500 F  , that means I can safely solder my #4 stranded copper wire within a close proximity to the potted copper rods !    It's also ideal for electrical resistance. And low shrinkage .   Here's a link to the 4461 IP : http://www.cotronics.com/vo/cotr/ea_electricalresistant.htm Brian 

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