[PSUBS-MAILIST] Castable Rubber

[hank pronk via Personal_Submersibles]

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, & lookingat them closely I can see that they mate the head of the connectorto 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 cableor whether a layer of rubber is applied some how over the cablehead & 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 aninch 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 acouple 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 thecable jacket. Then mold over this with the castable rubber to tidy it up. The theory is the silicone will compress under pressure on tothe jacket (which should itself compress), & seal the jacket betterthan just epoxy.I looked at a long video of Doug Jackson making through hullsfor 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=UDZQIDkWs4wRegards 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 & cameacross this castable silicone rubber.How to make a moldable castable rubber (homemade Sugru, Oogroo)

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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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