One of the reasons may be that those products were packaged in high
altitude areas such Colorado ( low pressure ) and brought to one of the
coasts ( higher pressure ). The bottle is pressed in till the inside and
outside pressures are equal. A 50 gallon metal tank can implode if  it is
attached to a vacuum pumped and air  taken out.
        Regards,
        Ramon

> -----Original Message-----
> From: [log in to unmask] [SMTP:[log in to unmask]]
> Sent: Wednesday, May 28, 2003 9:55 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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