In Reply to: Migration and compatibility of Dichloromethane in HDPE posted by Chandrakanth on August 04, 2007 at 00:33:44:

Dear Chandra.P,

First about Dichloromethane:

Dichloromethane (DCM) or methylene chloride is the chemical compound with the formula CH2Cl2. It is a colorless, volatile liquid with a moderately sweet aroma. It is widely used as a solvent, the general view being that it is one of the less harmful of the chlorocarbons, and it is miscible with most organic solvents.

Dichloromethane has a significant solubility in High Density Polyethylene at 25 degrees Celsius and 1 atmosphere system pressure: 6 volume%.

This solubility is below the available free volume in HDPE, hence we may assume that the diffusion coefficient is constant. The diffusivity in the conditions stated is:
1 E-11 m2/s.

The stationary migration / permeation rate is:
8 E -7 [gram / m3] x [m2/s].

On Dioctyl Phthalate there is currently no experimental information avalaible, please contact composite agency for experimental measurement regarding the diffusion, chemical resistance and mechanical behaviour / physical properties of High Density Polyethyelene.

: Hi!
: I would like to know the compatibility and migration of Dichloromethane and Dioctyl phthalate in HDPE. Any help on this is much appreciated.
: Thank you.
: Chandra.P

Please feel free to post your follow-up message below: