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and health and environmental concerns with halogenated materials, and in 2004 was made from polyethylene. However, polyethylene has a higher oxygen permeability, which in turn affects food spoilage prevention. For example, at 23 C and 95% relative humidity polyvinylidene chloride has an oxygen permeability of 0.6 cm³ um m^-2 d^-1 kPa^-1 while low-density polyethylene under the same conditions has an oxygen permeability

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