[PSUBS-MAILIST] Penetrator materials

[Alan via Personal_Submersibles]

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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