Water Permeability of materials
Water Permeability of materials
(OP)
Hey guys,
Hope all is well! I'm running into an issue of mold growth in an aqueous-filled pouch that we have. The film material that houses this pouch is TPU. We also have a pouch that is houses by a PVC film, but this does not have the mold issue. Does anyone know why these two materials behave so much differently? I can't find distinctive evidence between the difference in water permeability between PVC and TPU. Is moisture absorption the same thing? Please advise.
Thank you so much!
Nick
Hope all is well! I'm running into an issue of mold growth in an aqueous-filled pouch that we have. The film material that houses this pouch is TPU. We also have a pouch that is houses by a PVC film, but this does not have the mold issue. Does anyone know why these two materials behave so much differently? I can't find distinctive evidence between the difference in water permeability between PVC and TPU. Is moisture absorption the same thing? Please advise.
Thank you so much!
Nick





RE: Water Permeability of materials
If the mold is on the outside then the main difference could be what the mold is feeding on. The plasticizer in the PU or PVC could be different and the mold sees the additives in the TPU as viable food and those in the PVC as not viable food. For example, PVC is often stabilized with calcium zinc salts where the zinc is anti-microbial and may even help prevent mold growth.
We would need to know more to help more.
Chris DeArmitt PhD
President - Phantom Plastics LLC
Consulting, ideas and training on plastic materials
www.phantomplastics.com
RE: Water Permeability of materials
The materials that the gel is made up of are:
EDTA, Powder
Methyl Paraben, Powder
Deionized Water)
Carbopol
Quadrol Polyol (Medical Grade
Do you think that the mold could be feeding off any of these ingredients that could potentially be secreted through the TPU bag?