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CPVC Oxygen barrier?

CPVC meets all the requirements for my recording studio piping but there is the question of Oxygen barrier. Does CPVC allow O2 infiltration or not, anybody know? I could call the mfg but I'm headed out the door so no time right now. I plan to use it only to connect the outdoor unit to the buffer tank. FYI, the only ferrous material in the entire system is the pump bodies as I hadn't planned on going bronze with them.
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