<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div id="yui_3_16_0_ym19_1_1497914276112_3070"><span>Alan,</span></div><div id="yui_3_16_0_ym19_1_1497914276112_3070">I forgot to say thank you for that</div><div id="yui_3_16_0_ym19_1_1497914276112_3070">Hank</div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_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 size="2" face="Arial"> On Monday, June 19, 2017 5:10 PM, hank pronk via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv4537544272"><div><div style="color:#000;background-color:#fff;font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px;"><div><span>Alan,</span></div><div>Yes I have been running numbers but with polyester resin witch is a bit less. That is pretty darn cheap, pity I wasted 1,100 on trawl floats ;-( </div><div dir="ltr" id="yiv4537544272yui_3_16_0_ym19_1_1497913184633_5094">I will likely spend more to make foam for 12,000 feet for my next sub, Elementary 12000 The plan is build elementary 3000 so that I can swap out the occupant sphere with a sphere the same size but rated for 12,000 feet.</div><div dir="ltr" id="yiv4537544272yui_3_16_0_ym19_1_1497913184633_5093">Hank</div> <div class="yiv4537544272qtdSeparateBR"><br clear="none"><br clear="none"></div><div class="yiv4537544272yahoo_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 class="yiv4537544272yqt0203416878" id="yiv4537544272yqt86749"><div dir="ltr"><font size="2" face="Arial"> On Monday, June 19, 2017 4:07 PM, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> <div class="yiv4537544272y_msg_container"><div id="yiv4537544272"><div><div>Hank,</div><div>I have just looked at some figures on the 3M 5500 psi glass micro spheres on Ebay.</div><div>They are talking about a 50/50 ratio of spheres to epoxy resin. I don't know if you can</div><div>use less resin than this.</div><div>Resin weighs 1.1 grams per cubic centimetre, spheres are .38, so in a 50/50 mix you get </div><div>.26 gram buoyancy per cubic centimetre, or 260 grams per cubic litre. </div><div>You need to be 550 lb. buoyant, or 256kg. You would need 100 litres of mix to get this.</div><div>In a 50/50 mix that would cost 50 x $18:72 = $936 for the spheres & based on a price</div><div>of $400- for a 16 litres pack of epoxy, ($25 per litre) it would cost 50 x 25 = $1250</div><div>for the resin. Total of $2186.</div><div>You might be able to get the price down buying in bulk.</div><div>Cheers Alan</div><div><br clear="none"></div><div><br clear="none"><br clear="none"><div>Sent from my iPad</div></div><div><br clear="none">On 19/06/2017, at 1:51 PM, Alan via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div></div></blockquote></div><div><div>Hank,c </div><div class="yiv4537544272yqt2337909395" id="yiv4537544272yqtfd81814"><div id="yiv4537544272AppleMailSignature">have you had a look at this stuff...</div><div id="yiv4537544272AppleMailSignature"><a rel="nofollow" shape="rect" target="_blank" href="http://www.ebay.com/itm/MICROSPHERES-GLASS-BUBBLES-LOW-DENSITY-EPOXY-SYNTACTIC-FOAM-FILLER-1-GAL-1-5-KIT-/220528963762">http://www.ebay.com/itm/MICROSPHERES-GLASS-BUBBLES-LOW-DENSITY-EPOXY-SYNTACTIC-FOAM-FILLER-1-GAL-1-5-KIT-/220528963762</a></div><div id="yiv4537544272AppleMailSignature">One gallon in volume for $18:72. It says it crushes to 90% of it's volume at 5500 psi.</div><div id="yiv4537544272AppleMailSignature">And yes, enjoy a bit of detective work.</div><div id="yiv4537544272AppleMailSignature">Cheers Alan<br clear="none"><br clear="none">Sent from my iPad</div><div><br clear="none">On 19/06/2017, at 12:19 PM, hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="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:#000;background-color:#fff;font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px;"><div id="yiv4537544272yui_3_16_0_ym19_1_1497830829254_2526">Hi All,</div><div id="yiv4537544272yui_3_16_0_ym19_1_1497830829254_2526">Just been thinking about low cost ways to make foam. I am sure at the end of the day, I will make my foam the standard way, but it is still an interesting subject to explore. I have learned that microspheres are added to many things, even concrete. That got me thinking, if the compressive strength is there, the best product to reinforce the spheres should be the lightest possible material. Polypropylene is very light and has a compressive strength of 6,000 psi. The fun part about Polypropylene is, it can be recycled from bottle lids etc. I don't think it would take to much imagination to build an oven with a mixer inside and a microsphere injection port. Polypropylene has a specific gravity in the neighbourhood of .7g\cc that means a light weight foam can be made with microspheres and no macro spheres. I don't know about the water absorption properties yet.</div><div id="yiv4537544272yui_3_16_0_ym19_1_1497830829254_2526">Hank</div></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br clear="none"></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br clear="none"></div></blockquote></div></div></div><div class="yiv4537544272yqt2337909395" id="yiv4537544272yqtfd60827">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br clear="none"><br clear="none"></div></div> </div> </div> </div></div></div></div><div class="yqt0203416878" id="yqt88498">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div> </div> </div> </div></div></body></html>