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</o:shapelayout></xml><![endif]--></head><body lang=NL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Hi Hank, all<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>No foam but a spherical trawlerfloat can be a alternative float.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Not expensive and some can go to 1000 m /3000 ft. !<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Br, Emile<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Van:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>Namens </b>hank pronk via Personal_Submersibles<br><b>Verzonden:</b> maandag 19 juni 2017 2:19<br><b>Aan:</b> Personal Submersibles General Discussion<br><b>Onderwerp:</b> [PSUBS-MAILIST] alternative syntactic foam<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div id="yui_3_16_0_ym19_1_1497830829254_2526"><p class=MsoNormal style='background:white'><span style='font-size:8.0pt;font-family:"Helvetica","sans-serif";color:black'>Hi All,<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1497830829254_2526"><p class=MsoNormal style='background:white'><span style='font-size:8.0pt;font-family:"Helvetica","sans-serif";color:black'>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.<o:p></o:p></span></p></div><div id="yui_3_16_0_ym19_1_1497830829254_2526"><p class=MsoNormal style='background:white'><span style='font-size:8.0pt;font-family:"Helvetica","sans-serif";color:black'>Hank<o:p></o:p></span></p></div></div></div></body></html>