[PSUBS-MAILIST] syntactic foam.

[Alan via Personal_Submersibles]

Hank,
I saw a number of syntactic foam samples at the Underwater Intervention
Convention. The microspheres on the samples for deep diving were tiny.
The deeper you go, the smaller the spheres. That idea might have merit
depending on how deep you were going, as it would be easier to work with
the larger spheres. However if you spent the extra money on resin rather than
oil you would have a rigid product.
On Alvin I believe the foam was in sections that were pressure tested individually.
I think you can get an imploding chain reaction, hence the multiple sections so
you don't put all your eggs in one basket.
Alan


Sent from my iPad

> On 11/06/2017, at 9:04 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Greg,
> That is a pretty interesting idea.  I would have to do some math, because the spheres gain a lot of strength when reinforced with resin.   Very interesting, I would not have thought of that.
> Hank
> 
> 
> On Saturday, June 10, 2017 1:40 PM, james cottrell via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hank,
> 
> The density of paraffin wax is about 10% less than water and liquefies at about 155 F.  You can buy it in bulk online (10 lbs cost about 20$).
> 
> Greg
> 
> 
> From: james cottrell via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Saturday, June 10, 2017 2:48 PM
> Subject: Re: [PSUBS-MAILIST] syntactic foam.
> 
> Hank,
> 
> I like your idea. What if you were to use an environmentally friendly oil that is a solid at room temps? In other words heat it to liquid state , pour it in the spheres and let it solidify?
> 
> Greg
> 
> From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Saturday, June 10, 2017 1:44 PM
> Subject: [PSUBS-MAILIST] syntactic foam.
> 
> I have an idea, but not sure if it will work.  My idea is to fill a neutrally buoyant container with macro and micro spheres.  After the container is as full as possible, then fill with an environmentally friendly oil.  This would be more buoyant than using a resin and less complicated and cheaper.  My concern is, how well will the spheres stand up against breaking from being in contact with the other spheres and the container.   Are these spheres delicate?  
> Hank
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