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  2. Wood finishing - Wikipedia

    en.wikipedia.org/wiki/Wood_finishing

    Cures hard yet flexible, gloss or satin finish. Polyurethane oil based varnish: Slight ambering, comes in a variety of sheen Excellent protection against many substances, tough finish Durable after approx. 7 day curing period Relatively safe once VOCs evaporate, uses petroleum based solvents Moderate. Applied in coats with brush, roller or sprayer.

  3. 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 (/ 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.

  4. Varnish - Wikipedia

    en.wikipedia.org/wiki/Varnish

    Varnish on wood stairs Varnished oak floor. Varnish is a clear transparent hard protective coating or film. It is not to be confused with wood stain. It usually has a yellowish shade due to the manufacturing process and materials used, but it may also be pigmented as desired. It is sold commercially in various shades.

  5. Alkyd - Wikipedia

    en.wikipedia.org/wiki/Alkyd

    Alkyd or oil-urethane binders are used in casting for the creation of sand-based moulds. The alkyd resin is mixed with a polymeric isocyanate and a metallic drier, which speeds up the reaction. [9] Unlike other no-bake mould technologies, the process yields no toxic fumes, but the moulds need more air-curing time. [10]

  6. Moisture cure polyurethane - Wikipedia

    en.wikipedia.org/wiki/Moisture_cure_polyurethane

    Moisture cured polyurethane–urea coatings have been made by reacting 1,2,3-triazole rich polyether polyols with HMDI at NCO/OH eq. ratio of 1.2 to obtain isocyanate-terminated polyurethane prepolymers. The prepolymers were cured under atmospheric moisture to make polyurethane–urea free films.

  7. List of polyurethane applications - Wikipedia

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

    Polyurethane varnish may also lack the "hand-rubbed" lustre of drying oils such as linseed or tung oil; in contrast, however, it is capable of a much faster and higher "build" of film, accomplishing in two coats what may require many applications of oil. Polyurethane may also be applied over a straight oil finish, but because of the relatively ...

  8. Automotive paint - Wikipedia

    en.wikipedia.org/wiki/Automotive_paint

    As mass production of cars made the process untenable, paint began to be dried in ovens. Nowadays, two-component (catalyzed) paint is usually applied by robotic arms and cures in just a few hours either at room temperature or in heated booths. Until several decades ago lead, chromium, and other heavy metals were used in automotive paint.

  9. Spar varnish - Wikipedia

    en.wikipedia.org/wiki/Spar_varnish

    Owing to modern varnish materials, their weather and UV resistance is likely to be good, but the original requirement for flexibility has largely been forgotten. [ citation needed ] A common form of modern spar varnish is spar urethane , a polyurethane-based finish intended for outdoor use, where sunlight-, heat-, and water-resistance are ...

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