Those price differentials may well be down to production volumes affecting prices.
PET bottles are in wide scale use for low value products, Coke bottles, mineral water etc, the equivalent HDPE bottle needed to prevent loss of pressure, gas permeability is very much thicker.
However the thicker HDPE bottles are very significantly safer to the extent that quite corrosive chemicals like concentrated acids, Nitric, Sulphuric, Hydrochloric, Fluoric and also alkalis are supplied in HDPE bottles. In fgact it's now preferred to glass.
Nothing hazarous can be sold in PET of the thickness we see in common use and it's brittle unlike HDPE.
Last edited by Ian Grant; 03-19-2013 at 04:10 PM. Click to view previous post history.