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  2. Polyurethane - Wikipedia

    en.wikipedia.org/wiki/Polyurethane

    Polyurethane synthesis, wherein the urethane groups −NH−(C=O)−O− link the molecular units A kitchen sponge made of polyurethane foam . Polyurethane (/ ËŒ p É’ l i ˈ jÊŠÉ™r É™ ËŒ θ eɪ n,-j ʊəˈr É› θ eɪ n /; [1] often abbreviated PUR and PU) refers to a class of polymers composed of organic units joined by carbamate (urethane) links.

  3. Polyurethane foam - Wikipedia

    en.wikipedia.org/wiki/Polyurethane_foam

    An assortment of polyurethane foam products for cushioning and insulation. Polyurethane foam is a solid polymeric foam based on polyurethane chemistry. As a specialist synthetic material with highly diverse applications, polyurethane foams are primarily used for thermal insulation and as a cushioning material in mattresses, upholstered furniture or as seating in vehicles.

  4. List of polyurethane applications - Wikipedia

    en.wikipedia.org/wiki/List_of_polyurethane...

    Industrial Insulation. Rigid polyurethane foam is used in various industries to provide thermal insulation to installations and pipes. In particular, the piping for district heating systems in Europe is primarily insulated using a pre-insulated pipes sandwich assembly composed of a steel heat service pipe, an insulating layer (polyurethane foam) and a polyethylene (PE) casing, which are bonded ...

  5. Spray foam - Wikipedia

    en.wikipedia.org/wiki/Spray_foam

    Polyurethane is a closed-cell foam insulation material that initially contains a low-conductivity gas in its cells. [6] As a result of the high thermal resistance of the gas, spray polyurethane insulation typically has an initial R-value around R-3.4 to R-6.7 per inch. [6] In comparison, glass wool typically has an R-Value of only R-3 to R-4 ...

  6. Optical bonding - Wikipedia

    en.wikipedia.org/wiki/Optical_bonding

    There are a wide variety of adhesives used for optical bonding processes. Three of the most commonly used are silicone, epoxy, and polyurethane. [1] Below are overviews of the pros/cons of each adhesive type. Silicone: The most commonly found adhesive in optical bonding processes that dates back to the 1970s as a solution.

  7. Airless tire - Wikipedia

    en.wikipedia.org/wiki/Airless_tire

    An Airless tire fitted on a Mobike. Many bicycle-sharing systems use these tires to reduce maintenance.. In 1938, J. V. Martin in the United States invented a safety tire with hoops of hickory encased in rubber and fitted with criss cross spokes of ribbed rubber.

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