Fluroepoxy and Fluroacrylic Transparencies,
NAVAL RESEARCH LAB WASHINGTON DC
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Heavily fluorinated epoxy resins and acrylic polymers which have been synthesized and developed at NRL during the last fifteen years are transparent, nearly colorless plastics of low refractive index which seem to be prime candidates for aerospace transparency applications. The presence of 50 or more fluorocarbon in these classes of well-known polymers impart some properties which are uncommon and may be of special benefit in selected instances. For example, a helicopter with a fluoropolymer canopy could be expected to have better visibility in a rain storm than one with a conventional type because the unusual hydrophobicity of the fluorinated material would prevent wetting and consequent shimmering on the surfaces. Also, the refractive indices of the fluoropolymers are quite low compared to those of the common materials and this should result in less optical distortion of transmitted light.