fmerkel
Contributor
Never been asked about the operating pressure of an inhaler. Had to do a bit of research, and this is pretty rough guesstimates based on wikipedia/MDS info.
Replacing CFC's as a propellant they are now driven by 3 different propellants: dichlorodifluoromethane, dichlorotetrafluoroethane, dichlorodifluoromethane. They act both as a propellant and as a carrier for the [metaproterenol sulfate as micronized powder].
[Note on that - it is a powder 'thoroughly mixed in' as it were into these propellants. It does not do well with water, tends to make a clumpy mess and clog up the nozzel].
2 of the propellants seem to have an operating pressure of about 5 atm (82 and 89 kPa), at 68*. The other said 1.9 atm.
As indicated the driving pressure would drop off rapidly with depth. The optimal operation drops even with being chilled too much. I don't see them working well at any kind of depth at all, even if you could figure out how to rig one up to use.
Replacing CFC's as a propellant they are now driven by 3 different propellants: dichlorodifluoromethane, dichlorotetrafluoroethane, dichlorodifluoromethane. They act both as a propellant and as a carrier for the [metaproterenol sulfate as micronized powder].
[Note on that - it is a powder 'thoroughly mixed in' as it were into these propellants. It does not do well with water, tends to make a clumpy mess and clog up the nozzel].
2 of the propellants seem to have an operating pressure of about 5 atm (82 and 89 kPa), at 68*. The other said 1.9 atm.
As indicated the driving pressure would drop off rapidly with depth. The optimal operation drops even with being chilled too much. I don't see them working well at any kind of depth at all, even if you could figure out how to rig one up to use.
