Their tank is a hybrid mix of thin metal cylinder with fiberglass wrap to increase strength. At present there are no approved by the DOT pure fiberglass or carbon fiber cylinders out there for SCUBA.Ontario Diver:I just checked the Luxfer website http://www.luxfercylinders.com/products/scuba/specifications/us_imperial.shtml and they claim to have a Hoop Wrapped 4350psi SCUBA cylinder. Now I don't know if the Gods at TC have approved this puppy but the 106 cu ft weighs in at 34 lbs (Compared to 32 for a AL80) empty. Salt water bouyance is 3lbs positive when empty and about 5 lbs negative when full.
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Can you imagine how fragile a pure fiber cylinder would be? Just picture yourself being slammed into a rock tank first by surge. In fact, take a look at any well used tank and the abuse it takes. My clear coated AL80 has lots of blemishes in the finish where I have been banged into a rock or two by surge, or surf, or who knows what.
I would not use one for SCUBA. These are tanks designed specifically for SCBA which is on dry land use only by fire departments etc.