container as noted depends greatly on the end use for the product and the wall structural physical characteristics however upper limits for the wall thicknesses are in the range of 60 1000 of an inch various grades of polyethylene and polypropylene are useful as examplified in the following examples insofar as polyethylene is concerned low medium high and super high density polyethylene are useful high density polyethylene has a specific gravity in the range of 0 93 to 0 95 and super high density polyethylene has a specific gravity in the range of 0 96 to 0 965 a variety of sources of these resins are available for example the dow resins having grade numbers 36054 36056 69065 p xs8464804 are useful an additional resin is available from paxon aa60003 resins are also available from union carbide company limited and given resins number 5230 5250 and e678 002 350 ml long neck bottles were molded from polyethylene resin type d1 dow hdpe 36054 the bottles had an average empty weight of 26 g and an average wall thickness of 0 025 inches a color additive of titatium dioxide to provide a white pigment in the resin was incorporated the percent by weight of additive incorporated was 2 the bottles were filled with mineral spirits having a variation in percentage of aromatics weight loss tests were performed on the bottles by subjecting the bottles to oven storage at 50 u00b0 c and.