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gas permeability of silicone tubing

I noticed that silicone tubing was being recommended for CO2 systems and was
wondering if anyone considered the amount of CO2 that could be lost through
the walls of the tubing?

Or is this not a real concern because of the relatively low pressures we're
dealing with?

The following site states that "Relatively high gas permeability" is a
limitation of silicone tubing.


Wade Shimoda