Application Experience and Field Performance of Silvered Polymer Reflectors

    Research output: Contribution to conferencePaper


    The solar-weighted hemispheric reflectance of unweathered silvered acrylic mirrors exceeds 92%, and specular reflectance into a 4-milliradian, full-cone acceptance angle is greater than 90%. Comparison of outdoor and accelerated tests suggests that the protected silver can resist corrosion for the five-year life that is the current goal. An installation of parabolic troughs has been cleanedmonthly for two years, and reflectance is regularly returned to within a few percent of the initial reflectance values. In the presence of moisture, the silver/acrylic bond can delaminate to form a maze of tunnels and destroy specular reflectance. Proper edge preparation and protection delay the initiation of tunnels.
    Original languageAmerican English
    Number of pages10
    StatePublished - 1991
    EventInternational Solar Energy Society Conference - Denver, Colorado
    Duration: 19 Aug 199123 Aug 1991


    ConferenceInternational Solar Energy Society Conference
    CityDenver, Colorado

    Bibliographical note

    Prepared for the International Solar Energy Society Conference, Denver, Colorado

    NREL Publication Number

    • NREL/TP-257-4146


    • polymers
    • reflectors
    • silvered polymer
    • solar


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