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Relatively safe once VOCs evaporate, uses petroleum based solvents Moderate. Brush, roll or spray. Brushing needs good technique to avoid bubbles and streaks. Can be stripped using paint removers Cures hard yet flexible, gloss or satin finish. Polyurethane oil based varnish: Slight ambering, comes in a variety of sheen
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.
The following is a list of chemicals published as a requirement of Safe Drinking Water and Toxic Enforcement Act of 1986, commonly known as California Proposition 65, that are "known to the state to cause cancer or reproductive toxicity" as of January 3, 2020. [1]
Ethyl carbamate (also called urethane) is an organic compound with the formula CH 3 CH 2 OC(O)NH 2. It is an ester of carbamic acid and a white solid. Despite its name, it is not a component of polyurethanes. Because it is a carcinogen, it is rarely used, but naturally forms in low quantities in many types of fermented foods and drinks.
For substances used in food prior to January 1, 1958, a grandfather clause allows experience based on common use in food to be used in asserting an ingredient is safe under the conditions of their intended use. [3] The FDA can also explicitly withdraw the GRAS classification, as it did for trans fat in 2015. [6]
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.
C 8 fluorinated urethane constituent [3] that has later been replaced by a C 4 alternative. 3M reformulated Scotchgard and since June 2003 has replaced perfluorooctanesulfonic acid (PFOS) with perfluorobutanesulfonic acid (PFBS). [4] PFBS has a much shorter half-life in people than PFOS (a little over one month vs. 5.4 years).
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 ...