General view of a promotional display for Styrofoam insulation detailing the material's use in roofing. Invented in 1941 by researchers in Dow's Chemical Physics Lab, "Styrofoam" properly refers to the Dow Chemical Company’s trademarked brand of closed-cell extruded polystyrene foam commonly used for thermal insulation and craft applications.
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Dow Chemical Company. “Promotional Display for Styrofoam Insulation,” 1964. Dow Chemical Company Historical Image Collection, Box 4, Folder Products--Styrofoam Insulation. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/fb494950j.
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