[PSUBS-MAILIST] Castable Rubber

[Alan via Personal_Submersibles]

Hank,
that idea may have merit.
I would just have to be sure the silicone set inside.
Alan

Sent from my iPad

> On 15/11/2015, at 2:41 am, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> Are you talking about making a mould with casting rubber that fits over the cable with a void that you will fill with silicone.  Then remove the mould.
> That  would sure look nice.
> Hank
> 
> 
> 
> On Saturday, November 14, 2015 4:38 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Alan,
> If you go with casting resin, buy small quantities.  Once you open the containers, they don't last long after. 
> Hank
> 
> 
> 
> On Friday, November 13, 2015 8:47 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Thanks Hank.
> I will try the polyeurathane.
> I have some subconn wet matable connectors, & looking
> at them closely I can see that they mate the head of the connector
> to the cable with a thin layer of rubber for at least an inch back.
> I am not sure whether the rubber head is molded over the cable
> or whether a layer of rubber is applied some how over the cable
> head & cable to seal over the entry point of the cable into the connector head.
> However it seems to lend weight to my idea of applying silicone an
> inch up the cable. Now all I need to do is track down or make a pressure 
> Chamber.
> Cheers Alan
> 
> From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Saturday, November 14, 2015 3:12 PM
> Subject: Re: [PSUBS-MAILIST] Castable Rubber
> 
> Alan,
> I made two through hulls with pipe thread bushings almost the way you are.  I use poly urethane casting resin, I hate epoxy.  I tested my through hulls in my test chamber to 1,500 feet with zero issues.  I just silicone the threaded rod at the bottom to keep the resin in till it cures.   I made a plug connector for my Perry thrusters with casting resin also, that suff rules!
> Hank
> 
> 
> 
> 
> 
> On Friday, November 13, 2015 5:58 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> As this has created a lot of interest, I thought I'd follow up with a
> couple of drawings of my through hull idea :) (Attached at bottom.)
> I am using a common reducer fitting to butt or key the epoxy.
> There are standard reducer fittings with o-rings.
> I am going to silicone over the outer part of the fitting & along the
> cable jacket. Then mold over this with the castable rubber to 
> tidy it up. 
> The theory is the silicone will compress under pressure on to
> the jacket (which should itself compress), & seal the jacket better
> than just epoxy.
> I looked at a long video of Doug Jackson making through hulls
> for his rov by epoxying in brass pins. They were failing badly in most cases.
> I will never trust epoxy again.
> https://www.youtube.com/watch?v=UDZQIDkWs4w
> Regards Alan
> 
> 
> From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Friday, November 13, 2015 10:52 PM
> Subject: [PSUBS-MAILIST] Castable Rubber
> 
> Was thinking about home made electrical through hulls & came
> across this castable silicone rubber.
> How to make a moldable castable rubber (homemade Sugru, Oogroo)
>  
>  
> 
>  
>  
>  
>  
>  
> How to make a moldable castable rubber (homemade Sugr...
> View on www.youtube.com
> Preview by Yahoo
>  
> Basically it's builders silicone mixed with corn flour about 50/50.
> There are other recipes with builders silicone & baby powder.
> My thought was to pot wires inside a suitable bronze or SS threaded fitting 
> & encase the electrical sheathing where it enters the fitting with straight silicone.
> Then when hardened, cast the silicone / corn flour mix over the top to tidy it up.
> The simple recipe may have a lot of other applications.
> Cheers Alan
> 
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