<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Greg, </div><div id="AppleMailSignature">you are right about the need for the vacuum chamber with the wax pour. There</div><div id="AppleMailSignature">would be bubbles left that could compress within the wax matrix; whereas with resin being so strong bubbles wouldn't be a problem. </div><div id="AppleMailSignature">This would limit your wax / micro-sphere sections to the size of your vacuum chamber.</div><div id="AppleMailSignature">Alan<br>Sent from my iPad</div><div><br>On 11/06/2017, at 12:12 PM, james cottrell via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="color:#000; background-color:#fff; font-family:verdana, helvetica, sans-serif;font-size:13px"><div><span></span></div><div class="qtdSeparateBR" id="yui_3_16_0_1_1497139025763_6956">Hank,</div><div class="qtdSeparateBR" id="yui_3_16_0_1_1497139025763_7033"><br></div><div class="qtdSeparateBR" id="yui_3_16_0_1_1497139025763_7049">Using a phase changing material might alleviate one of the challenges that arise when making buoyancy foam with two part resin- the heat created limits the amount that can be poured at one time. A large section can sometimes require many pours. Too much heat and the resin will boil and be ruined.</div><div class="qtdSeparateBR" id="yui_3_16_0_1_1497139025763_7072"><br></div><div class="qtdSeparateBR" id="yui_3_16_0_1_1497139025763_7080" dir="ltr">If the wax works at depth, I don't see any reason that very thick ( and cheap!) sections couldn't be done at one time. In theory the wax could be melted and poured in a vacuum chamber.</div><div class="qtdSeparateBR" id="yui_3_16_0_1_1497139025763_7082" dir="ltr"><br></div><div class="qtdSeparateBR" id="yui_3_16_0_1_1497139025763_7081" dir="ltr">Greg<br><br></div><div class="yahoo_quoted" id="yui_3_16_0_1_1497139025763_6979" style="display: block;"> <div id="yui_3_16_0_1_1497139025763_6978" style="font-family: verdana, helvetica, sans-serif; font-size: 13px;"> <div id="yui_3_16_0_1_1497139025763_6977" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_1_1497139025763_6976" dir="ltr"> <font id="yui_3_16_0_1_1497139025763_6975" face="Arial" size="2"> <hr size="1" id="yui_3_16_0_1_1497139025763_7010"> <b><span style="font-weight: bold;">From:</span></b> hank pronk 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> Saturday, June 10, 2017 6:44 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] syntactic foam.<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1497139025763_7034"><br><div id="yiv5022147386"><div id="yui_3_16_0_1_1497139025763_7127"><div id="yui_3_16_0_1_1497139025763_7126" style="color: rgb(0, 0, 0); font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 13px; background-color: rgb(255, 255, 255);"><div><span>Alan,</span></div><div><span>Luckily I have lots of time to work this out. After looking at the cost for home made foam, it is not bad at all. I will of coarse keep looking at other ideas, like the wax, that would have never occurred to me.</span></div><div id="yiv5022147386yui_3_16_0_1_1497134026337_6827"><span>Hank</span></div> <div class="yiv5022147386qtdSeparateBR"><br clear="none"><br clear="none"></div><div class="yiv5022147386yahoo_quoted" id="yui_3_16_0_1_1497139025763_7125" style="display: block;"> <div id="yui_3_16_0_1_1497139025763_7124" style="font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 13px;"> <div id="yui_3_16_0_1_1497139025763_7123" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div class="yiv5022147386yqt1494578414" id="yiv5022147386yqt30660"><div dir="ltr"><font face="Arial" size="2"> On Saturday, June 10, 2017 4:18 PM, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> <div class="yiv5022147386y_msg_container" id="yui_3_16_0_1_1497139025763_7130"><div id="yiv5022147386"><div id="yui_3_16_0_1_1497139025763_7129"><div id="yui_3_16_0_1_1497139025763_7128">Hank,</div><div id="yiv5022147386AppleMailSignature">I saw a number of syntactic foam samples at the Underwater Intervention</div><div id="yiv5022147386AppleMailSignature">Convention. The microspheres on the samples for deep diving were tiny.</div><div id="yiv5022147386AppleMailSignature">The deeper you go, the smaller the spheres. That idea might have merit</div><div id="yiv5022147386AppleMailSignature">depending on how deep you were going, as it would be easier to work with</div><div id="yiv5022147386AppleMailSignature">the larger spheres. However if you spent the extra money on resin rather than</div><div id="yiv5022147386AppleMailSignature">oil you would have a rigid product.</div><div id="yiv5022147386AppleMailSignature">On Alvin I believe the foam was in sections that were pressure tested individually.</div><div id="yiv5022147386AppleMailSignature">I think you can get an imploding chain reaction, hence the multiple sections so</div><div id="yiv5022147386AppleMailSignature">you don't put all your eggs in one basket.</div><div id="yiv5022147386AppleMailSignature">Alan</div><div id="yiv5022147386AppleMailSignature"><br clear="none"><br clear="none">Sent from my iPad</div><div class="yiv5022147386yqt5693722461" id="yiv5022147386yqt76394"><div><br clear="none">On 11/06/2017, at 9:04 AM, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div style="color: rgb(0, 0, 0); font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 13px; background-color: rgb(255, 255, 255);"><div><span>Greg,</span></div><div><span>That is a pretty interesting idea. I would have to do some math, because the spheres gain a lot of strength when reinforced with resin. Very interesting, I would not have thought of that.</span></div><div id="yiv5022147386yui_3_16_0_1_1497128490912_3668"><span>Hank</span></div> <div class="yiv5022147386qtdSeparateBR"><br clear="none"><br clear="none"></div><div class="yiv5022147386yahoo_quoted" style="display: block;"> <div style="font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 13px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font face="Arial" size="2"> On Saturday, June 10, 2017 1:40 PM, james cottrell via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> <div class="yiv5022147386y_msg_container"><div id="yiv5022147386"><div><div style="color: rgb(0, 0, 0); font-family: verdana, helvetica, sans-serif; font-size: 13px; background-color: rgb(255, 255, 255);"><div id="yiv5022147386yui_3_16_0_1_1497123293582_3006"><span>Hank,</span></div><div id="yiv5022147386yui_3_16_0_1_1497123293582_3006"><span><br clear="none"></span></div><div id="yiv5022147386yui_3_16_0_1_1497123293582_3006"><span id="yiv5022147386yui_3_16_0_1_1497123293582_3119">The density of paraffin wax is about 10% less than water and liquefies at about 155 F. You can buy it in bulk online (10 lbs cost about 20$).</span></div><div id="yiv5022147386yui_3_16_0_1_1497123293582_3006"><span><br clear="none"></span></div><div id="yiv5022147386yui_3_16_0_1_1497123293582_3006"><span>Greg</span></div><div class="yiv5022147386qtdSeparateBR" id="yiv5022147386yui_3_16_0_1_1497123293582_3121"><br clear="none"><br clear="none"></div><div class="yiv5022147386yahoo_quoted" style="display: block;"> <div style="font-family: verdana, helvetica, sans-serif; font-size: 13px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div class="yiv5022147386yqt5838243348" id="yiv5022147386yqt95149"><div dir="ltr"> <font face="Arial" size="2"> </font><hr size="1"> <b><span style="font-weight: bold;">From:</span></b> james cottrell via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, June 10, 2017 2:48 PM<br clear="none"> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] syntactic foam.<br clear="none"> </div> <div class="yiv5022147386y_msg_container"><br clear="none"><div id="yiv5022147386"><div><div style="color: rgb(0, 0, 0); font-family: verdana, helvetica, sans-serif; font-size: 13px; background-color: rgb(255, 255, 255);"><div><span></span></div><div class="yiv5022147386qtdSeparateBR" id="yiv5022147386yui_3_16_0_1_1497117981886_3402">Hank,</div><div class="yiv5022147386qtdSeparateBR" id="yiv5022147386yui_3_16_0_1_1497117981886_3579"><br clear="none"></div><div class="yiv5022147386qtdSeparateBR" id="yiv5022147386yui_3_16_0_1_1497117981886_3612" dir="ltr">I like your idea. What if you were to use an environmentally friendly oil that is a solid at room temps? In other words heat it to liquid state , pour it in the spheres and let it solidify?</div><div class="yiv5022147386qtdSeparateBR" id="yiv5022147386yui_3_16_0_1_1497117981886_3613" dir="ltr"><br clear="none"></div><div class="yiv5022147386qtdSeparateBR" id="yiv5022147386yui_3_16_0_1_1497117981886_3616" dir="ltr">Greg<br clear="none"><br clear="none"></div><div class="yiv5022147386yahoo_quoted" id="yiv5022147386yui_3_16_0_1_1497117981886_3585" style="display: block;"> <div id="yiv5022147386yui_3_16_0_1_1497117981886_3584" style="font-family: verdana, helvetica, sans-serif; font-size: 13px;"> <div id="yiv5022147386yui_3_16_0_1_1497117981886_3583" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div class="yiv5022147386yqt8910543808" id="yiv5022147386yqt02767"><div id="yiv5022147386yui_3_16_0_1_1497117981886_3582" dir="ltr"> <font id="yiv5022147386yui_3_16_0_1_1497117981886_3581" face="Arial" size="2"> </font><hr size="1" id="yiv5022147386yui_3_16_0_1_1497117981886_3580"> <b><span style="font-weight: bold;">From:</span></b> hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, June 10, 2017 1:44 PM<br clear="none"> <b><span style="font-weight: bold;">Subject:</span></b> [PSUBS-MAILIST] syntactic foam.<br clear="none"> </div> <div class="yiv5022147386y_msg_container" id="yiv5022147386yui_3_16_0_1_1497117981886_3586"><br clear="none"><div id="yiv5022147386"><div id="yiv5022147386yui_3_16_0_1_1497117981886_3615"><div id="yiv5022147386yui_3_16_0_1_1497117981886_3614" style="color: rgb(0, 0, 0); font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 13px; background-color: rgb(255, 255, 255);"><div id="yiv5022147386yui_3_16_0_1_1497115959959_2837">I have an idea, but not sure if it will work. My idea is to fill a neutrally buoyant container with macro and micro spheres. After the container is as full as possible, then fill with an environmentally friendly oil. This would be more buoyant than using a resin and less complicated and cheaper. My concern is, how well will the spheres stand up against breaking from being in contact with the other spheres and the container. Are these spheres delicate? </div><div id="yiv5022147386yui_3_16_0_1_1497115959959_2837">Hank</div></div></div></div>_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a id="yiv5022147386yui_3_16_0_1_1497117981886_3627" href="mailto:Personal_Submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank" rel="nofollow" shape="rect">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"><br clear="none"><br clear="none"></div></div> </div> </div> </div></div><div id="yiv5022147386DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br clear="none">
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