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Chris Hellas <chris@de*.de*.co*.uk*> wrote:- > ... charge to 300 bar. They are very light!. You can pick one up that is > full with one finger. ... You'll need extra lead to sink them ... what you > lose from your back you end up carrying on your waist The saving in weight <is> useful, in transporting diving gear to remote sites if you can find weights there: this comes back to having no lead weights but a ballast bag to be filled on site with sand or stones. And a diver in difficulties will more readily empty a ballast bag than ditch expensive lead. I fear that if someone wants a ballast bag, he will have to make it himself: to diving gear shops ballast bags will mean much less lead being sold. If a cylinder (or anything else) is lost overboard in deep water, it seems more likely to be recovered if it floats. fdc02@ix*.ne*.co* (Doug Chapman) wrote:- > General purpose composite cylinders are typically made of glass fibers, > aramid (Kevlar) fibers, or graphite/carbon fibers embedded in a plastic > matrix material, typically an epoxy or vinylester plastic resin (e.g. > fiberglass reinforced plastic used in boats) ... If cylinders made largely of carbonacous organic compounds become common, likely some authoritarian police-state types will be pleased!: when destroying seized unauthorized scuba gear the cylinders can be (emptied and) chucked into the patrol base's incinerator with the rest of the gear instead of having to be trucked miles to a foundry to be watched being melted down there.
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