[PSUBS-MAILIST] Penetrator materials

[Alan via Personal_Submersibles]

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


Sent from my iPad

> 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/1891122
> Will see how it goes!
> Alan
> 
> Sent from my iPad
> 
>> 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 on
> to 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 way
> of 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 local
> product ...
> http://www.electrolube.co.nz/products/encapsulation-resins-polyurethane/ur5118/polyurethane-potting-compound/
> Cheers Alan
>  
> 
> Sent from my iPad
> 
>> 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'm
>> looking 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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