[PSUBS-MAILIST] Penetrator materials

Tue May 16 21:52:45 EDT 2017

Sean, 
thanks, I have ordered this product for encapsulating..
http://nz.element14.com/robnor/el110h-bk-250/encapsulant-2k-flex-pu-gp-marine/dp/1891122
It looks to tick all the boxes. I have a good glue / sealant on order. I am now
looking at suitable electrical cable for use outside the hull.
Cheers Alan

Sent from my iPad

> On 17/05/2017, at 1:27 PM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> MG Chemicals have a variety of epoxy potting and encapsulation compounds, and I think one of them is specifically marketed as being flexible, which might be exactly what you're looking for. Check their website.
> 
> Sean
> 
> 
>> On May 16, 2017 7:01:13 PM MDT, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> Hank,
>> Juries not out on how I want to do that.
>> I don't think I'll have the glue on the conductor, I will just embed the conductor & insulation
>> & a portion of the cable sheath in the epoxy & then go over the aluminum fitting & cable
>> with the glue & then encapsulate it all in polyurethane potting mix.
>> Alan
>> 
>> 
>> From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
>> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
>> Sent: Wednesday, May 17, 2017 12:37 PM
>> Subject: Re: [PSUBS-MAILIST] Penetrator materials
>> 
>> Alan,
>> Your idea to use a silicone or similar to back up the epoxy is a good idea.  My epo! xy multi wire connector will let teeny tiny air bubbles through when I exceed 1,000 psi.  You will have to strip the wire back far enough for the silicone to stick to the conductor.
>> Hank
>> 
>> 
>> On Tuesday, May 16, 2017 6:18 PM, Stephen Fordyce via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> !
>> 
>> 
>> Hi Alan,
>> I'd be interested to see what you come up with on cable.  My research indicated a polyurethane outer sheath was the way to go (and it's held up extremely well to the punishment my caving lights have seen) but that's also really expensive and hard to get.  I previously used PVC and it held up well enough, slightly different application though.
>> 
>> The China stuff - yep there's a lot of good stuff, but also a lot of bad stuff.  Your experience is pretty bad though, usually they are a lot better than that.
>> 
>> Cheers,
>> Steve
>> 
>> On Wed, May 17, 2017 at 10:03 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> Thanks Steve,
>> I found some in a local sports shop. I'll see how it likes the
>> marine environment!
>>    Have changed tack a bit as I thought I should be nailing down
>> exactly what cable I'm going to use so I know what material I am
>> gluing to. G.L. wants self extinguishing sheathing / insulation
>> & halogen free. Also can't be hydroscopic. 
>>    Got my pressure sensors back from China (again) they now have
>> the ! right fitting but still a sloppy fit. They sent them out with an 
>> over-sized o-ring that wouldn't fit, even though I supplied them a 
>> first stage regulator for testing. I am thinking that your original
>> suggestion of an adapter would have been a better way to go!
>> Alan 
>> 
>> 
>> Sent from my iPad
>> 
>>> On 17/05/2017, at 10:54 AM, Stephen Fordyce via Personal_Submersibles <personal_submersibles at psubs. org> wrote:
>>> 
>>> Hi Alan,
>>> Try searching for Shoe Goo - I gather it's the same stuff. I've got some off ebay in Australia and used with good success on wetsuit gloves for caving. Liquid Elect! rical Engineering Tape is also good if you brush it on in thin layers.
>>> 
>>> Cheers,
>>> Steve
>>> 
>>> On 17 May 2017 6:50 am, "Alan via Personal_Submersibles" <personal_submersibles at psubs. org> wrote:
>>> Hank,
>>> thanks, I feel I am getting somewhere.
>>> I can't find Goop in N.Z. but have been looking at other marine products.
>>> You are right about the silicone not being ideal. 90 % of the marine adhesives
>>> I looked at are polyurethane based products.  Although the outer moulded
>>> section will be polyurethane, sometimes mouldable products lose a bit of their
>>> adhesion with their "bulking" additives.
>>> Keith Gordon gave me a link to a product he has used for splicing underwater
>>> cables. You squirt the glue in to heat shrink tubing that is around the cables, then
>>> heat the ends of the heat shrink tubing to close it. 
>>> I will do a bit more research on that today.
>>> Alan
>>> 
>>> 
>>> Sent from my iPad
>>> 
>>>> On 17/05/2017, at 12:11 AM, hank pronk via Personal_Submersibles ed <personal_submersibles at psubs.o rg> wrote:
>>>> 
>>>> Alan,
>>>> Got it, there is a way better option than silicone for that.  The product is call Goop or shoe goo.  This stuff is amazing, it sticks much better than silicone and is super tough.  I patch my waders with it, and you can not peel it off, no way no how.
>>>> Hank
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