| http://www.w3.org/ns/prov#value | - Materials for lenses, 5, should have high purity (greater than 99% pure) transparent single crystals, polycrystalline and amorphous organic and inorganic materials with low dielectric constants, low dielectric losses such as alumina porcelains, zircon porcelains, lithia porcelains, high temperature porcelains, glasses, alumina, mullite, forsterite, steatite, cordierite, enstatite, BN, AlN, Si3N4,
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