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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.
One of the disadvantages of a polyurethane-based varnish is the tendency to yellow over time. This is because the hydroxyl groups of a regular alkyd are reacted with TDI to produce a urethane-alkyd. This introduces a high degree of aromaticity and hence tendency to yellow. [14]
RPM International Inc. is an American multinational company with subsidiaries that manufacture and market specialty coatings, sealants and building materials.Industrial brands include Tremco, Carboline, Universal Sealants, Stonhard, RPM/Belgium, Euco, Day-Glo and Dryvit.
Chemical Society Reviews publishes "Tutorial reviews" and "Critical reviews". The former are written to be of relevance both to the general research chemist who is new to the field, as well as the expert, whereas the latter aim to provide a deeper understanding of the topic in hand, but retain their accessibility through an introduction written for the general reader.
Urethane may refer to: Ethyl carbamate, a chemical compound which is an ester of carbamic acid; Polyurethane, a polymer composed of a chain of organic units joined by ...
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 first, and thus far unique, cell-spar platform was Kerr-McGee's Red Hawk spar (7 ea. 8 m (26 ft) diameter cells). [6] Field-depletion occurred 4 years after production started, so Red Hawk was decommissioned in 2014 under the Bureau of Safety and Environmental Enforcement 's " Rigs-to-Reefs " program, at which time it was the deepest ...
A user review of a product on Amazon.com. A user review is a review conducted by any person who has access to the internet and publishes their experience to a review site or social media platform following product testing or the evaluation of a service. [1]
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