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Doug or anyone else: I have the letter from Luxfer that addresses several 
of the matters Doug mentioned in his informative post about composites. 
The exemption for underwater use is from DOT. One of the things Luxfer is 
checking is how the tanks have fared from expanding and contracting 
during filling/emptying cycles. According to Luxfer there will not be 
available for some time smaller volume bottles (<45cf) but rather only 
larger volume bottles. This doesn't help the rebreather industry. If any 
rebreather manufacturer is using composite bottles in their units, 
according to Luxfer, the bottles would not have DOT approval for 
underwater use. E-mail me privately for fax of documents and Luxfer 
contact person with the scoop and scooper. The 4500 psi bottles are great 
for deco gases because they are, heightwise, about the size of aluminum 
30's and have a slightly larger diameter. As I mentioned previously, 
there is a  new tech carbon fiber bottle being tested with no metal liner. 

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