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Polyurethane foam made with an aromatic isocyanate, which has been exposed to UV light. Readily apparent is the discoloration that occurs over time. Custom-cast polyurethane objects. Polyurethane products have many uses. Over three quarters of the global consumption of polyurethane products is in the form of foams, with flexible and rigid types ...
This is of particular interest in the area of polyurethane coatings, where light stability is a critical factor and is the main reason that aliphatic isocyanates are used in making polyurethane coatings. When PU foam, which is made using aromatic isocyanates, is exposed to visible light, it discolors, turning from off-white to yellow to reddish ...
The coating had its first sea trials in 1940, on U-11, a Type IIB. [1] [5] U-67, a Type IX, was the first operational U-boat with this coating. [2] After its first war patrol, it put in at Wilhelmshaven probably sometime in April 1941 where it was given the coating. The coating covered the conning tower and sides of the U-boat, but not to the deck.
Ultra-durable, water-based polyurethane makes an excellent coating for adding slip resistance, beautiful appearance, and protection from penetrating stains. Look for a polyurethane coating that has no VOCs for maximum environmental friendliness. Saltillo tile may be sealed with a penetrating sealant or a film forming sealant (coating).
Polyurethane dispersion, or PUD, is understood to be a polyurethane polymer resin dispersed in water, rather than a solvent, although some cosolvent may be used.Its manufacture involves the synthesis of polyurethanes having carboxylic acid functionality or nonionic hydrophiles like PEG (polyethylene glycol) incorporated into, or pendant from, the polymer backbone. [1]
It is one of the world's largest manufacturers of paints and coating products. [2] Jotun manufactures paints and varnishes for marine and industrial purposes, synthetic resins, floor coverings, polyurethane foam, heavy-duty coatings, binders, unsaturated polyesters, glass-fiber reinforced polyester pipes, tanks, and more. [3]
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