<html><head><meta http-equiv="content-type" content="text/html; charset=us-ascii"></head><body dir="auto"><div><span></span></div><div><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1447461477147_2815"><span id="yui_3_16_0_1_1447461477147_2814">Jon,</span></div><div id="yui_3_16_0_1_1447461477147_2815"><span>I sent this email out last year as an idea for using castable rubber in a electrical penetrator.</span></div><div id="yui_3_16_0_1_1447461477147_2815"><span>Hank is already doing something similar minus the castable rubber.</span></div><div id="yui_3_16_0_1_1447461477147_2815"><span>The idea is to buy a bronze reducer fitting of appropriate size from a marine supplier & machine</span></div><div id="yui_3_16_0_1_1447461477147_2815"><span>an o-ring grove in it. The bronze fitting Preferably has </span>a conical reduction shape ( not shown in diagram ). The reducer compresses the epoxy under pressure in to the narrow area & stops it extruding through. Doug was having all sorts of problems epoxying pins straight through a fitting without reduction.</div><div id="yui_3_16_0_1_1447461477147_2815">In this iteration I epoxy the wires & sheath in to the reducer. You could use pins which would</div><div id="yui_3_16_0_1_1447461477147_2815"><span>be more in line with G. L. as if the wires are sheared water could run through the individual</span></div><div id="yui_3_16_0_1_1447461477147_2815"><span>wire sheaths, but bend the pins. I looked closely at how my subconn penetrators were made, & they mold a thin </span>rubber sheath over the cable about an inch back from where it enters the penetrator. So as</div><div id="yui_3_16_0_1_1447461477147_2815"><span>the wiring sheath compresses under pressure this rubber sheath moves with it. The drawing isn't the greatest but I can elaborate if interested. I have a 3000 psi test cylinder to test these but haven't got round to it.</span></div><div id="yui_3_16_0_1_1447461477147_2815"><span><br></span></div><div id="yui_3_16_0_1_1447461477147_2815"><span> As this has created a lot of interest, I thought I'd follow up with a</span></div><div id="yui_3_16_0_1_1447461477147_2797" dir="ltr"><span id="yui_3_16_0_1_1447461477147_2816">couple of drawings of my through hull idea :) (Attached at bottom.)</span></div><div id="yui_3_16_0_1_1447461477147_2790"><span id="yui_3_16_0_1_1447461477147_2838">I am using a common reducer fitting to butt or key the epoxy.</span></div><div id="yui_3_16_0_1_1447461477147_2790"><span id="yui_3_16_0_1_1447461477147_3353">There are standard reducer fittings with o-rings.</span></div><div id="yui_3_16_0_1_1447461477147_2790"><span id="yui_3_16_0_1_1447461477147_3334">I am going to silicone over the outer part of the fitting & along the</span></div><div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span id="yui_3_16_0_1_1447461477147_3417">cable jacket. Then mold over this with the castable rubber to </span></div><div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span>tidy it up. </span></div><div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span id="yui_3_16_0_1_1447461477147_3601">The theory is the silicone will compress under pressure on to</span></div><div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span id="yui_3_16_0_1_1447461477147_3397">the jacket (which should itself compress), & seal the jacket better</span></div><div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span>than just epoxy.</span></div><div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span id="yui_3_16_0_1_1447461477147_3123">I looked at a long video of Doug Jackson making through hulls</span></div><div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span id="yui_3_16_0_1_1447461477147_3122">for his rov by epoxying in brass pins. They were failing badly in most cases.</span></div><div id="yui_3_16_0_1_1447461477147_2790" dir="ltr"><span id="yui_3_16_0_1_1447461477147_3121">I will never trust epoxy again.</span></div><div dir="ltr" id="yui_3_16_0_1_1447461477147_3166"><a href="https://www.youtube.com/watch?v=UDZQIDkWs4w" id="yui_3_16_0_1_1447461477147_3159">https://www.youtube.com/watch?v=UDZQIDkWs4w</a></div><div dir="ltr" id="yui_3_16_0_1_1447461477147_3166">Regards Alan</div><div dir="ltr" id="yui_3_16_0_1_1447461477147_3166"><br></div><div dir="ltr" id="yui_3_16_0_1_1447461477147_3166"><br></div> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1447461477147_2743"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1447461477147_2742"> <div dir="ltr" id="yui_3_16_0_1_1447461477147_2741"> <hr size="1" id="yui_3_16_0_1_1447461477147_2880"> <font size="2" face="Arial" id="yui_3_16_0_1_1447461477147_2740"> <b id="yui_3_16_0_1_1447461477147_3120"><span style="font-weight:bold;" id="yui_3_16_0_1_1447461477147_3119">From:</span></b> Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br> <b><span style="font-weight: bold;">Sent:</span></b> Friday, November 13, 2015 10:52 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> [PSUBS-MAILIST] Castable Rubber<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1447461477147_3105"><br><div id="yiv6996647659"><div id="yui_3_16_0_1_1447461477147_3104"><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;" id="yui_3_16_0_1_1447461477147_3103"><div id="yiv6996647659yui_3_16_0_1_1447407586257_2469">Was thinking about home made electrical through hulls & came</div><div id="yiv6996647659yui_3_16_0_1_1447407586257_2469" dir="ltr">across this castable silicone rubber.</div><div id="yiv6996647659yui_3_16_0_1_1447407586257_2469" dir="ltr"><a rel="nofollow" target="_blank" href="https://www.youtube.com/watch?v=YKw8pxgPJFU" id="yiv6996647659yui_3_16_0_1_1447407586257_2515">How to make a moldable castable rubber (homemade Sugru, Oogroo)</a><br></div><div style="width:450px;font-family:'Georgia', 'Times', 'Times New Roman', 'serif';margin-top:5px;margin-bottom:5px;background-color:#ffffff;" id="yiv6996647659enhancrCard_0" class="yiv6996647659link-enhancr-attachment yiv6996647659link-enhancr-element yiv6996647659richcompose-card"><table class="yiv6996647659link-enhancr-element" cellspacing="0" cellpadding="0" border="0" style="width:450px;height:170px;display:block;" 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class="yiv6996647659link-enhancr-element yiv6996647659link-enhancr-image-wrap yiv6996647659enhancr-image-crop" rowspan="5" style="vertical-align:middle;width:168px;height:168px;border-collapse:collapse;background-color:rgb(255, 255, 255);" id="yiv6996647659yui_3_16_0_1_1447407586257_2542"><div class="yiv6996647659link-enhancr-element" style="width:168px;" align="center" id="yiv6996647659yui_3_16_0_1_1447407586257_2541"><a rel="nofollow" target="_blank" href="https://www.youtube.com/watch?v=YKw8pxgPJFU" class="yiv6996647659link-enhancr-card-urlWrapper yiv6996647659link-enhancr-element" style="text-decoration:none;text-decoration:none;color:#000000;" id="yiv6996647659yui_3_16_0_1_1447407586257_2540"><img alt="image" class="yiv6996647659link-enhancr-thumbnail-image yiv6996647659link-enhancr-element yiv6996647659yahoo-ignore-inline-image" width="168" height="168" style="display:block;margin:auto;" id="yiv6996647659yui_3_16_0_1_1447407586257_2539" data-id="1f1ebe2a-3a9b-c4eb-ef19-c8ea9253c8f0" src="cid:"></a></div></td><td rowspan="5" class="yiv6996647659link-enhancr-element" style="width:1px;background-color:#e5e5e5;font-size:0pt;border-collapse:collapse;" id="yiv6996647659yui_3_16_0_1_1447407586257_2695"><div class="yiv6996647659link-enhancr-element" style="width:1px;background-color:#e5e5e5;font-size:1pt;"> </div></td><td rowspan="5" class="yiv6996647659link-enhancr-element" style="width:14px;background-color:#ffffff;font-size:0pt;border-collapse:collapse;" id="yiv6996647659yui_3_16_0_1_1447407586257_2551"><div class="yiv6996647659link-enhancr-element" style="width:14px;background-color:#ffffff;font-size:14pt;"> </div></td><td colspan="2" class="yiv6996647659link-enhancr-element" style="height:6px;background-color:#ffffff;font-size:0pt;border-collapse:collapse;"><div class="yiv6996647659link-enhancr-element" style="height:6px;background-color:#ffffff;font-size:6pt;"> </div></td><td rowspan="5" class="yiv6996647659link-enhancr-element" style="width:20px;background-color:#ffffff;font-size:0pt;border-collapse:collapse;" id="yui_3_16_0_1_1447461477147_3585"><div class="yiv6996647659link-enhancr-element" style="width:20px;background-color:#ffffff;font-size:20pt;" id="yui_3_16_0_1_1447461477147_3584"> </div></td><td class="yiv6996647659link-enhancr-element" rowspan="5" width="1" style="width:1px;background-color:#e5e5e5;font-size:1pt;border-collapse:collapse;"><div class="yiv6996647659link-enhancr-element" style="width:1px;background-color:#e5e5e5;font-size:1pt;"> </div></td></tr><tr id="yiv6996647659yui_3_16_0_1_1447407586257_2536"><td class="yiv6996647659link-enhancr-element" colspan="2" style="width:100%;vertical-align:middle;font-family:'Georgia', 'Times', 'Times New Roman', 'serif';" id="yiv6996647659yui_3_16_0_1_1447407586257_2535"><div class="yiv6996647659link-enhancr-text-part yiv6996647659link-enhancr-element" style="line-height:16.5px;background-color:#ffffff;height:135px;width:245px;" id="yiv6996647659yui_3_16_0_1_1447407586257_2534"><div class="yiv6996647659link-enhancr-element" style="word-wrap:break-word;" id="yui_3_16_0_1_1447461477147_3220"><span class="yiv6996647659link-enhancr-element yiv6996647659icon yiv6996647659icon-shrink yiv6996647659link-enhancr-toggle"></span><span class="yiv6996647659link-enhancr-element yiv6996647659icon yiv6996647659icon-close yiv6996647659link-enhancr-delete"></span><a rel="nofollow" target="_blank" href="https://www.youtube.com/watch?v=YKw8pxgPJFU" class="yiv6996647659link-enhancr-card-urlWrapper yiv6996647659link-enhancr-element" style="text-decoration:none;text-decoration:none;color:#000000;line-height:100%;font-size:18px;display:block;" id="yui_3_16_0_1_1447461477147_3219"><span class="yiv6996647659link-enhancr-element yiv6996647659link-enhancr-card-title" style="margin:0;font-weight:normal;margin-bottom:3px;font-size:18px;line-height:21px;max-height:43px;color:#000000;overflow:hidden;display:inline-block;" id="yui_3_16_0_1_1447461477147_3221">How to make a moldable castable rubber (homemade Sugr...</span></a></div></div></td></tr><tr id="yiv6996647659yui_3_16_0_1_1447407586257_2554"><td colspan="2" class="yiv6996647659link-enhancr-element" style="height:4px;background-color:#ffffff;font-size:0pt;border-collapse:collapse;" id="yiv6996647659yui_3_16_0_1_1447407586257_2553"><div class="yiv6996647659link-enhancr-element" style="height:4px;background-color:#ffffff;font-size:4pt;" id="yiv6996647659yui_3_16_0_1_1447407586257_2552"></div></td></tr><tr id="yui_3_16_0_1_1447461477147_3218"><td class="yiv6996647659link-enhancr-element" style="vertical-align:middle;font-family:'Arial', 'Helvetica Neue', 'Helvetica', 'sans-serif';" id="yui_3_16_0_1_1447461477147_3589"><div class="yiv6996647659link-enhancr-element" style="font-size:0pt;" id="yui_3_16_0_1_1447461477147_3588"><a rel="nofollow" target="_blank" href="https://www.youtube.com/watch?v=YKw8pxgPJFU" class="yiv6996647659link-enhancr-card-url yiv6996647659link-enhancr-element" style="color:black;text-decoration:none;text-decoration:none;cursor:pointer;"><span class="yiv6996647659link-enhancr-element yiv6996647659link-enhancr-view-on" style="display:inline-block;line-height:11px;max-width:145px;min-width:85px;overflow:hidden;max-height:13px;" id="yiv6996647659yui_3_16_0_1_1447407586257_2531"><span class="yiv6996647659link-enhancr-element yiv6996647659link-enhancr-mobile-no-resize" style="vertical-align:middle;font-size:9px;line-height:11px;color:#999999;">View on <span style="font-weight:bold;" class="yiv6996647659link-enhancr-view-on-domain">www.youtube.com</span></span></span></a><span class="yiv6996647659link-enhancr-video-width yiv6996647659link-enhancr-element" title="459" title-off=""></span><span class="yiv6996647659link-enhancr-video-height yiv6996647659link-enhancr-element" title="344" title-off=""></span><span class="yiv6996647659link-enhancr-video-src yiv6996647659link-enhancr-element" title="https://www.youtube.com/embed/YKw8pxgPJFU?feature=oembed" title-off=""></span></div></td><td class="yiv6996647659link-enhancr-element" style="vertical-align:middle;width:100px;font-family:'Arial', 'Helvetica Neue', 'Helvetica', 'sans-serif';" id="yui_3_16_0_1_1447461477147_3217"><div class="yiv6996647659link-enhancr-element yiv6996647659link-enhancr-preview-wrapper" style="max-width:100px;min-width:80px;overflow:hidden;text-align:right;line-height:11px;max-height:13px;font-size:0pt;" id="yui_3_16_0_1_1447461477147_3216"><span class="yiv6996647659link-enhancr-element yiv6996647659link-enhancr-preview-by yiv6996647659link-enhancr-mobile-no-resize" style="vertical-align:middle;font-size:9px;line-height:11px;color:#999999;" id="yui_3_16_0_1_1447461477147_3587">Preview by Yahoo</span></div></td></tr><tr id="yiv6996647659yui_3_16_0_1_1447407586257_2557"><td colspan="2" class="yiv6996647659link-enhancr-element" style="height:9px;background-color:#ffffff;font-size:0pt;border-collapse:collapse;" id="yiv6996647659yui_3_16_0_1_1447407586257_2556"><div class="yiv6996647659link-enhancr-element" style="height:9px;background-color:#ffffff;font-size:9pt;" id="yiv6996647659yui_3_16_0_1_1447407586257_2555"></div></td></tr><tr class="yiv6996647659link-enhancr-element" id="yui_3_16_0_1_1447461477147_3215"><td class="yiv6996647659link-enhancr-element" colspan="8" style="height:1px;background-color:#e5e5e5;font-size:1px;border-collapse:collapse;" id="yui_3_16_0_1_1447461477147_3214"><div class="yiv6996647659link-enhancr-element" style="height:1px;background-color:#e5e5e5;font-size:1px;line-height:0px;" id="yui_3_16_0_1_1447461477147_3213"> </div></td></tr></tbody></table></div><div id="yiv6996647659yui_3_16_0_1_1447407586257_2469">Basically it's builders silicone mixed with corn flour about 50/50.</div><div id="yiv6996647659yui_3_16_0_1_1447407586257_2469">There are other recipes with builders silicone & baby powder.</div><div id="yiv6996647659yui_3_16_0_1_1447407586257_2469">My thought was to pot wires inside a suitable bronze or SS threaded fitting </div><div id="yiv6996647659yui_3_16_0_1_1447407586257_2469" dir="ltr">& encase the electrical sheathing where it enters the fitting with straight silicone.</div><div id="yiv6996647659yui_3_16_0_1_1447407586257_2469" dir="ltr">Then when hardened, cast the silicone / corn flour mix over the top to tidy it up.</div><div id="yiv6996647659yui_3_16_0_1_1447407586257_2469" dir="ltr">The simple recipe may have a lot of other applications.</div><div id="yiv6996647659yui_3_16_0_1_1447407586257_2469" dir="ltr">Cheers Alan</div></div></div></div><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org" 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