<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">I would say that was good test. It established you can not use this foam. You just have to push on and find a syntactic foam that will work.<div><br></div><div>Cliff<br><br><div id="AppleMailSignature" dir="ltr">Sent from my iPhone</div><div dir="ltr"><br>On Jul 8, 2019, at 8:43 PM, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><div style="font-family:Arial, sans-serif; font-size:10pt;"><font size="2" style=""><font face="Arial, sans-serif">Bad news, the test piece that I dropped down to 900' , it didn't crush , but it absorbed water. So it lost a lot of its buoyancy. </font></font><div><font face="Arial, sans-serif" size="2"><br></font></div><div><font face="Arial, sans-serif" size="2">Brian</font></div><div><font face="Arial, sans-serif" size="2"><br></font></div><div><font face="Arial, sans-serif" size="2"><br></font><br><span style="font-family: Arial, sans-serif; font-size: 10pt;">--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:</span><br><br><span style="font-family: Arial, sans-serif; font-size: 10pt;">From: Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span><br><span style="font-family: Arial, sans-serif; font-size: 10pt;">To: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span><br><span style="font-family: Arial, sans-serif; font-size: 10pt;">Subject: Re: [PSUBS-MAILIST] Foam preperation</span><br><span style="font-family: Arial, sans-serif; font-size: 10pt;">Date: Fri, 28 Jun 2019 16:15:09 -0700</span><br><br><div style="font-family: Arial, sans-serif; font-size: 10pt;"><font size="2">Alan, I've done one small test piece so far and it did give off some heat. I'm planning on doing a larger piece that I'm going to drop in the ocean, it will be interesting to see how that goes. I'm more inclined to pour larger amounts for a couple of reasons, first I think you get a better and more accurate mix of the A and B, and also where I'm pouring into my cavities I don't want to inadvertently seal off areas that I will not be able to get to to complete the pour. So I'd rather error on over pouring a bit so I have foam pushing out the vent holes. </font><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"> </font><br><br><span style="font-size: 10pt;">--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:</span><br><br><span style="font-size: 10pt;">From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span><br><span style="font-size: 10pt;">To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span><br><span style="font-size: 10pt;">Subject: Re: [PSUBS-MAILIST] Foam preperation</span><br><span style="font-size: 10pt;">Date: Sat, 29 Jun 2019 09:18:40 +1200</span><br><br><div style="font-size: 10pt;"></div><div style="font-size: 10pt;">All,</div><div style="font-size: 10pt;">as we are talking about testing this for General Psubs use I'll elaborate</div><div style="font-size: 10pt;">on something I mentioned earlier.</div><div style="font-size: 10pt;">In the product specifications below it mentions that in the setting of this product</div><div style="font-size: 10pt;">the temperature is critical, & that temperatures below 75 degrees F will make a</div><div style="font-size: 10pt;">denser product. One would assume that temperatures above 75 F would make</div><div style="font-size: 10pt;">a less dense & hence weaker product. </div><div style="font-size: 10pt;">With 2 part chemical reactions there is generally a heat produced & this is </div><div style="font-size: 10pt;">exponentially greater the thicker the pour. I used to use casting resins for art</div><div style="font-size: 10pt;">& they would get very hot on thick casts.</div><div style="font-size: 10pt;">If this were the case then filling any large voids in one pour may cause the</div><div style="font-size: 10pt;">centre of the material to be a lot weaker than the outside.</div><div style="font-size: 10pt;">To check this we could ask the rep about thick pours, do a thick pour & cut it</div><div style="font-size: 10pt;">in cross section to see if it is less dense in the middle or stick a heat probe in</div><div style="font-size: 10pt;">the middle of the pour to check for an increased temperature.</div><div style="font-size: 10pt;"><ul><li><font style="background-color: rgba(255, 255, 255, 0);">All expansion rates and times given are temperature critical. Temperatures below 75 degrees F will lower the expansion rate therefore requiring more foam. Ideal working temperature is 75 to 80 degrees F or above.</font></li><li><font style="background-color: rgba(255, 255, 255, 0);">Accurate measuring of these products is extremely critical.</font></li></ul><div>Alan</div></div><div style="font-size: 10pt;"><br></div><div style="font-size: 10pt;"><ul><li><font style="background-color: rgba(255, 255, 255, 0);">All expansion rates and times given are temperature critical. Temperatures below 75 degrees F will lower the expansion rate therefore requiring more foam. Ideal working temperature is 75 to 80 degrees F or above.</font></li><li><font style="background-color: rgba(255, 255, 255, 0);">Accurate measuring of these products is extremely critical.</font></li></ul>On 28/06/2019, at 11:04 PM, Jon Wallace via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote style="font-size: 10pt;"><div><div style="font-family: times new roman, new york, times, serif; font-size: 16px;"><div></div>
<div>Not my forte, but given the hardness of this product when cured is there really an expectation that it is going to deform in a visually measurable way and spring back into shape from a depth test? Seems like it's more likely to either structurally fail or not with obvious non-elastic results such as cracks, cavities, etc, hence the weight test to see if it absorbs water. I'm thinking the dunk test from the sailboat is a good first start.</div><div><br></div><div>The cost of this product seems to be on par with trawler floats from a pound to pound buoyancy perspective but it has the advantage of allowing custom shaping. I'm interested in the results.</div><div><br></div><div>Should we invest in a small amount of this product and put it to some more rigorous pressure testing?</div></div></div></blockquote><blockquote style="font-size: 10pt;"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote><span style="font-size: 10pt;">_______________________________________________
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