The slowest permeation rate, therefore, will occur where penetration is most critical : at the primary packaging level.
2.
While helium has documented permeation constants ( thus a calculable permeation rate ) through glasses, ceramics, and synthetic materials, inert gases such as helium will not permeate most bulk metals.
3.
Finally, while the test data will provide information on individual chemicals based on " worst-case scenario " continuous contact testing, most industrial exposures are not continuous and are in fact mixtures of chemical, for which permeation rates are different.
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