<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><span>Aan,</span></div><div dir="ltr"><span>I have been looking at that on </span>eBay, even just for experimenting. </div><div dir="ltr">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 Sunday, June 18, 2017 7:51 PM, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv1800132192"><div><div>Hank,</div><div id="yiv1800132192AppleMailSignature">have you had a look at this stuff...</div><div id="yiv1800132192AppleMailSignature"><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="yiv1800132192AppleMailSignature">One gallon in volume for $18:72. It says it crushes to 90% of it's volume at 5500 psi.</div><div id="yiv1800132192AppleMailSignature">And yes, enjoy a bit of detective work.</div><div id="yiv1800132192AppleMailSignature">Cheers Alan<br clear="none"><br clear="none">Sent from my iPad</div><div class="yiv1800132192yqt9936523489" id="yiv1800132192yqt54457"><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="yiv1800132192yui_3_16_0_ym19_1_1497830829254_2526">Hi All,</div><div id="yiv1800132192yui_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="yiv1800132192yui_3_16_0_ym19_1_1497830829254_2526">Hank</div></div></div></blockquote></div><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 class="yqt9936523489" id="yqt71712">_______________________________________________<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>