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Peel-off mats are made up of multiple sheets of polyethylene film coated with acrylic adhesive that traps particles. Each layer peels off to reveal a new clean surface. The adhesive backing prevents microbial growth and contamination. Mats used outside clean rooms and laboratories are designed to withhold foreign pollution elements. This goal ...
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.
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Typically, high-resiliency, high-density plastic foam with a thin plastic film is used to keep out water that might get by the seams. Closed-cell foam is often used for smaller cushions, which can sometimes double as flotation devices. [28] The evolution of boat seating reflects a journey of creative adaptation and technological advancement.
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The simplest form of seat is the chair, [72] which is a piece of furniture designed to allow a single person to sit down, which has a back and legs, as well as a platform for sitting. [73] Chairs often feature cushions made from various fabrics. [74]