[PSUBS-MAILIST] Penetrator materials

Tue May 16 05:38:16 EDT 2017

Alan,There is really no need for the silicone layer, in fact it might cause you grief trying to get another material to stick to it.  If you need some testing done on the windshield stuff, let me know, I have some left over.Hank 

    On Monday, May 15, 2017 7:10 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Thanks, I will have a look at that it sounds like it would have theadhesion that's needed.This stuff is designed for encapsulating electronics in marineenvironments. I was going to use it over a thin layer of silicone butmight not use the silicone now. Alan

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On 16/05/2017, at 12:06 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Alan,I have good luck with windshield adhesive (poly urethane)  I used it as a liquid rubber.  It is super tough and cheap.Hank 

    On Monday, May 15, 2017 5:40 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Ended up ordering this encapsulating 2 part flexible polyurethane,  that is suitable for a marine environment.http://nz.element14.com/robnor/el110h-bk-250/encapsulant-2k-flex-pu-gp-marine/dp/1891122Will see how it goes!Alan

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On 16/05/2017, at 3:43 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Thanks Hank,I need the two wires to angle off to the sides as they are soldered onto the corners of the LED.Yes I could thread the outside of the nozzle & put on a blue globe cable gland,I have some. Even though Carsten & Emile are advocates of the Blue globe,they do fit two on each penetration; one on the outside, one on the inside &I can't do that with the light fitting.   I have come across a few likely candidates for the outer covering in the wayof a mouldable polyurethane for marine applications......https://www.aeromarineproducts.com/product/urethane-75a-encapsulating-compound/This is an American product I can't locate here in N.Z.. Have found a localproduct ...http://www.electrolube.co.nz/products/encapsulation-resins-polyurethane/ur5118/polyurethane-potting-compound/Cheers Alan 

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On 15/05/2017, at 11:59 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Alan,In an effort to keep it easy and clean looking, I would extend the penetrator body at the wet side to allow for  threading on a compression fitting.   Slide your cable into that and snug the nut and it is done and clean looking.   Also from my experience, I would not angle the wires, I would make it strait through and strip as much of the jacket as possible.  I am sure your drawing is not representing the actual amount to be stripped, but it should be more significant.  Keeping it strait will make it a lot easier, I have done over 20 wires in one penetrator with a strait threaded bore.  Hank 

    On Sunday, May 14, 2017 9:40 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

  Hi,I have a number of penetrators to do on my lights & other items, & I'mlooking for the best materials for them.My design is as below. It is the base of my light housing.I have stripped a small section of wire that runs through the epoxy. I am not sure of the best material on the next 2 layers.I am looking at this marine silicone, to seal about an inch up the wiring jacket.http://www.selleys.co.nz/car-care/sealants/marine/Am thinking I will apply this silicone with a brush & then tidy things up & both protect the silicone & support the cable with a molded rubberized outer layer.I am not sure of a suitable moldable material for a marine environment.Am guessing I will need about the same hardness as a standard o-ring.Any suggestions on the material or comments on the design thanks.Alan
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