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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 ...
Spar varnishes are thus not necessarily the best choice for outdoor woodwork that does not need to bend in service. Despite this, the widespread perception of "marine products" as "tough" led to domestic outdoor varnishes being branded as "Spar varnish" and sold on the virtue of their weather- and UV-resistance. These claims may be more or less ...
Pigments in paints and stains protect against UV damage, while UV-absorbers are added to polyurethane and other varnishes (in particular "spar" varnish) to work against UV damage. Polyurethanes are typically the most resistant to water exposure, high humidity, temperature extremes, and fungus or mildew, which also adversely affect varnish and ...
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.
During a Communist Party meeting earlier this month, Cuban leader Miguel Díaz-Canel blamed U.S. sanctions -- the government’s favorite whipping boy -- for the crisis.
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Spar varnish This page was last edited on 14 March 2020, at 17:16 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 ...
Bill Belichick is taking on the North Carolina football coaching job. He is now the winningest NFL coach ever to coach college football.
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