<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><FONT size="2">This 16lb density might work:</FONT><DIV><FONT size="2"><BR></FONT></DIV><DIV><FONT size="2"><A href="http://www.uscomposites.com/foam.html">http://www.uscomposites.com/foam.html</A></FONT></DIV><DIV><FONT size="2"><BR></FONT></DIV><DIV><FONT size="2"><BR></FONT></DIV><DIV><FONT size="2">Brian</FONT></DIV><DIV><FONT size="2"><BR></FONT></DIV><DIV><FONT size="2"><BR></FONT><BR><SPAN style="font-size: 10pt;">--- personal_submersibles@psubs.org wrote:</SPAN><BR><BR><SPAN style="font-size: 10pt;">From: Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-size: 10pt;">To: "Personal Submersibles General Discussion" <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-size: 10pt;">Subject: Re: [PSUBS-MAILIST] Macrospheres</SPAN><BR><SPAN style="font-size: 10pt;">Date: Wed, 12 Jun 2019 09:55:51 -0700</SPAN><BR><BR><DIV style="font-size: 10pt; font-family: Arial, sans-serif;"><FONT size="2"> Or maybe a polyurethane foam would be strong enough ? Without the macrospheres </FONT><BR><BR><SPAN style="font-size: 10pt;">--- personal_submersibles@psubs.org wrote:</SPAN><BR><BR><SPAN style="font-size: 10pt;">From: Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-size: 10pt;">To: "PSubs " <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-size: 10pt;">Subject: [PSUBS-MAILIST] Macrospheres</SPAN><BR><SPAN style="font-size: 10pt;">Date: Wed, 12 Jun 2019 09:45:05 -0700</SPAN><BR><BR><DIV style="font-size: 10pt; font-family: Arial, sans-serif;"><DIV><FONT size="2" style=""><FONT face="Arial, sans-serif">Hi All,</FONT></FONT></DIV><FONT size="2" style=""><FONT face="Arial, sans-serif"><DIV><FONT size="2" style=""><FONT face="Arial, sans-serif"><BR></FONT></FONT></DIV>Does anyone know a good source for macrospheres? 500psi would suffice. I was thinking I could fill the upper chamber area of my ferro-cement with macrospheres and seal that top area off . I could use almost pure macro spheres since that area is already a defined chamber. I tried to find Cliff's reference to </FONT></FONT> "Macrospheres - Cumings Corp BA-38 1/4-3/8"
12-15 lbm/ft3" from his article on the psubs website but no luck. <DIV><BR></DIV><DIV>Brian</DIV><DIV><BR></DIV><DIV><BR></DIV></DIV><SPAN style="font-size: 10pt;">
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