| http://www.w3.org/ns/prov#value | - The refractive index of PMD homopolymer is in the range of 13308-13345. or somewhat below the optimum value of 1.336, the index of refraction of human tears. it has been found in this respect that the copolymers of PMD and tetrafluorethylene provide materials which are especially suitable in the practice of the present invention in that they exhibit refractive indices in the desired range. are cha
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