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Shellac was once very common anywhere paints or varnishes were sold (such as hardware stores). However, cheaper and more abrasion- and chemical-resistant finishes, such as polyurethane, have almost completely replaced it in decorative residential wood finishing such as hardwood floors, wooden wainscoting plank panelling, and kitchen cabinets ...
Lacquer is typically sprayed on, within a spray booth that evacuates overspray and minimizes the risk of combustion. The rule of thumb is that a clear wood finish formulated to be sprayed is a lacquer, but if it is formulated to be brushed on then it is a varnish. Thus, by far most pieces of wooden furniture are lacquered. [citation needed]
Known applications of lacquer in China included coffins, music instruments, furniture, and various household items. [16] Lacquer mixed with powdered cinnabar is used to produce the traditional red lacquerware from China. A maki-e and mother-of-pearl inlay cabinet that was exported from Japan to Europe in the 16th century.
The oldest lacquer tree found is from the Jōmon period in Japan, 12600 years ago. [1] [2] The oldest lacquerware in the world, burial ornaments which were created in 9th millennium B.C., were unearthed in early Jomon period tombs, at the Kakinoshima site in Hakodate, Hokkaido, Japan.
Open-cell flexible polyurethane foam is used to make many kitchen and bathroom sponges. The combination of low cost, high flexibility and high abrasion and tear resistance make polyurethanes excellent materials for scrubbing applications. [3] Polyurethane sponges have been shown to reduce the risk of spreading certain bacteria. [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.