| http://www.w3.org/ns/prov#value | - Other ingredients such as antioxidants, stabilizers, plasticizers, and the like may be contained in the membrane to improve its strength, flexibility, physical stability, to increase the rate of permeation and/or selectivity, or for other purposes, provided that the composition of 3 such ingredients and the amounts in which they are employed and are not such as to render the membrane impermeable t
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