Posted by Diffusion-polymers.com on February 14, 2005 at 08:57:00:

In Reply to: Diffusion of Propylene Glycol through 0.5 mm HDPE posted by Indranath Sengupta on February 11, 2005 at 14:13:44:

Dear Indranath Sengupta,

While the solubility of Propylene Glycol (solubility parameter=30.7) in HDPE is even lower than Isopropyl Alcohol (solubility parameter =23.5), it is not expected that the High Density Poly Ethylene (solubility parameter = 16.4) swells during the diffusion process. So, it is a normal Fickian diffusion process (a constant diffusion coefficient).

Kind Regards,

: Dear Forum,
: I need to to know, how does Propylene Glycol diffuse
: through 0.5 mm wall thickness HDPE moulded container.

: Regards,
: Indranath