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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