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May 2003

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Subject:
From:
"Crepeau, Phil" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 28 May 2003 07:29:42 -0700
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hi,

i believe this is caused by diffusion of gases throught the hdpe.  since it is influenced by concentration and since the gases inside diffuse through the hdpe much better than the gases outside (n2, o2, etc.) diffuse in they do and the bottle collapses.  sorta of what the original uranium enrichment process was all about.

see steve, i'm not afraid to make a fool of myself.

phil

-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Wednesday, May 28, 2003 6:55 AM
To: [log in to unmask]
Subject: [TN] why do HDPE bottles get deformed?


We've all seen them, High Density Polyethylene bottles that have become all "sucked in", to the point where they're almost triangular.  I have bottles with rosin fluxes, and others with decap chemicals (Dynasolve products) that have done this - all in their original containers. They've been stored in an friendly environment, no strange temperatures or anything unusual.  Over the years I've seen many other products in poly bottles do the same.  The bottles seem to get very hard, and never recover their original shape.  Does anyone know what causes this?

Bruce Tostevin
Benchmark Electronics
Hudson, New Hampshire

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