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Originally, spar varnish was a "long oil" varnish, composed primarily of drying oil with a small proportion of resin, usually boiled linseed oil and rosin. [1] This gave flexibility, [ 2 ] even though its weather resistance was still poor, and thus re-coating was required relatively frequently.
Pigments in paints and stains protect against UV damage. UV-absorbers are added to polyurethane and other varnishes (e.g. spar varnish) to work against UV damage but are decreasingly effective over the course of 2–4 years, depending on the quantity and quality of UV-absorbers added, as well as the severity and duration of sun exposure.
After a successful run with the product, Z-Spar was sold to a company called Koppers. Shortly after Z-Spar joined Koppers, they would purchase the Woolsey line, merging the two companies under one name. Pettit Marine Paint was established in 1972, after the unification of three lines of marine paint manufactures – Pettit, Woolsey, and Z-Spar. [4]
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.
The Valspar Corporation is an American manufacturer of paint and coatings based in Minneapolis, Minnesota. With over 11,000 employees in 26 countries and a company history that spans two centuries, it was the sixth largest paint and coating corporation in the world. [4] Valspar was founded in 1806 as a paint dealership in Boston, Massachusetts.
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.
New ship being prepared for launch, showing fresh anti-fouling paint Ship hull being cleaned of fouling in drydock. Anti-fouling paint is a specialized category of coatings applied as the outer (outboard) layer to the hull of a ship or boat, to slow the growth of and facilitate detachment of subaquatic organisms that attach to the hull and can affect a vessel's performance and durability.
A spar is a pole of wood, metal or lightweight materials such as carbon fibre used in the rigging of a sailing vessel to carry or support its sail. These include yards , booms , and masts , which serve both to deploy sail and resist compressive and bending forces, as well as the bowsprit and spinnaker pole .
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