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@hippy
The higher numbers aren't "purity" values. They are some value a guy at Reynolds decided to give a tubing type.
For example, higher numbers might indicate things like butted tubing (eg. tube that's thinner in the middle, thicker at the ends) or they might indicate it's heat-treated tubing (makes the tubing stronger therefore thinner tube can be used in a frame) or air-hardened tube (again so thinner/lighter tubing can be used).