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How often must carbon composite cylinders be retested?

Luxfer's carbon composite cylinders must be retested (i.e., requalified for continued service) every five years, the same as aluminum oxygen cylinders. In fact, Luxfer was the first company to receive a full five-year requalification exemption for its carbon composite cylinders from the U.S. Department of Transportation. (Some competitive composite cylinders must be requalified every three years.)

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