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Synthetic repellents tend to be more effective and/or longer lasting than "natural" repellents. [1] [2]For protection against mosquito bites, the U.S. Centers for Disease Control (CDC) recommends DEET, icaridin (picaridin, KBR 3023), oil of lemon eucalyptus (para-menthane-diol or PMD), IR3535 and 2-undecanone with the caveat that higher percentages of the active ingredient provide longer ...
Operation Big Buzz was a U.S. military entomological warfare field test conducted in 1955 on Savannah, Georgia's predominantly Black Carver Village neighborhood. [1] The tests involved dispersing over 300,000 mosquitoes from aircraft and through ground dispersal methods.
DEET is often sold and used in spray or lotion in concentrations up to 100%. [13] Consumer Reports found a direct correlation between DEET concentration and hours of protection against insect bites. 100% DEET was found to offer up to 12 hours of protection while several lower concentration DEET formulations (20–34%) offered 3–6 hours of ...
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Spray foam insulation or spray polyurethane foam (SPF) is an alternative to traditional building insulation such as fiberglass. A two-component mixture composed of isocyanate and polyol resin comes together at the tip of a gun, and forms an expanding foam that is sprayed onto roof tiles, concrete slabs, into wall cavities, or through holes ...
Polyurethane synthesis, wherein the urethane groups −NH−(C=O)−O− link the molecular units A kitchen sponge made of polyurethane foam . Polyurethane (/ ˌ p ɒ l i ˈ jʊər ə ˌ θ eɪ n,-j ʊəˈr ɛ θ eɪ n /; [1] often abbreviated PUR and PU) refers to a class of polymers composed of organic units joined by carbamate (urethane) links.
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