Re: Migration and compatibility of Dichloromethane ...  

Posted by composite agency on August 09, 2007 at 11:32:44:

In Reply to: Re: Migration and compatibility of Dichloromethane in HDPE posted by composite agency on August 08, 2007 at 09:26:28:

Important Notice:

Generally, polyethylenes are not chemical resistant to chlorinated hydrocarbons. The figures below do not contain the intrinsic chemical reaction / chemical degradation kinetics of the species with the high density polyethylene. Contact us for more info regarding the impact of the above on the physical and mechanical properties of the plastic.

Composite Agency

: 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 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

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