Hi all,
I'm seeking for some help as I am putting together a specification for pneumatic tubing used to transport "pure & dry"gas.
The main contrainst is the following:
-The material has to be plasticiser-free (to limit risk of contamination)
-As we are working with "Dry gas", the water vapour permeability must be low. Our "wettest" gas has a dew point of -20C
-The gas has a max CO2 content of 2%, so the material should have a low CO2 (and other gases if possible) permeabilty.
-Working temperature: Application 1: 0C to 50C Application 2: 0C to 180C
Unfortunately, I don't have accurate value to give as until this moment no one in my company seems to have been looking into this. (If ain't broke, don't fix it...)
Although, I struggled getting data for most of the material I was looking at (I ended up using this Table), I have put aside, Nylon (water vapour permeability too high) and PVC (phthalate).
For application 1, 0C up to 50C, I'm curious about Polyurethane, (ether rather than ester based), but I can't find any relevant information on this material. Could anyone communicate me some value, please? Otherwise, based on the value I have at the moment, my preference goes to PP over PET due to lower water vapour permeability.
For application 2, 0C up to 180C, PTFE is currently used but after looking at the values, I was wondering if PFA would be better for this application. Again, I can't find gas permeability value for PFA and I was wondering if someone could communicate me some values, please?
My background being mechanical engineering, I would more than welcome advices, critics or helpful link.
Thank you for your help
I'm seeking for some help as I am putting together a specification for pneumatic tubing used to transport "pure & dry"gas.
The main contrainst is the following:
-The material has to be plasticiser-free (to limit risk of contamination)
-As we are working with "Dry gas", the water vapour permeability must be low. Our "wettest" gas has a dew point of -20C
-The gas has a max CO2 content of 2%, so the material should have a low CO2 (and other gases if possible) permeabilty.
-Working temperature: Application 1: 0C to 50C Application 2: 0C to 180C
Unfortunately, I don't have accurate value to give as until this moment no one in my company seems to have been looking into this. (If ain't broke, don't fix it...)
Although, I struggled getting data for most of the material I was looking at (I ended up using this Table), I have put aside, Nylon (water vapour permeability too high) and PVC (phthalate).
For application 1, 0C up to 50C, I'm curious about Polyurethane, (ether rather than ester based), but I can't find any relevant information on this material. Could anyone communicate me some value, please? Otherwise, based on the value I have at the moment, my preference goes to PP over PET due to lower water vapour permeability.
For application 2, 0C up to 180C, PTFE is currently used but after looking at the values, I was wondering if PFA would be better for this application. Again, I can't find gas permeability value for PFA and I was wondering if someone could communicate me some values, please?
My background being mechanical engineering, I would more than welcome advices, critics or helpful link.
Thank you for your help