By Dravis - 6/8/2016 12:22:36 PM
Hi!
A friend of mine is working on a project of making underwater fishing spears from EC carbon tubes.
To avoid problems with the water pressure crushing or distorting the tubes, He is considering filling the tubes with a liquid ..
Radiator coolant antifreeze seems an obvious choice, since these mad underwater fishermen dive in from the ice in winter .. 
We all know that water expands radically when frozen, so that would certainly crack the tubes ..
How is the chemical tolerance of the different EC carbon tubes to Ethylen Glycol?
How do they stand up to temperatures down to -20 Celcius? (They will not have to be anything but "stable" at these temps, once "in use" they will be above freezing..
(Can't dive in frozen water ..  )
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By Dravis - 6/16/2016 7:54:29 AM
Thanks Warren! 
I suggested a mixture of glass bubbles and a structural filler, like the West systems "High Density Filler"
I'm not sure how far the "Spear -maker" has gotten along the lines of filling the tubes .. hopefully there will be an update soon ..
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