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Polyol, or Component A, is a group of substances that serve as the basis for obtaining polyurethane foam. When reacting with the second component, isocyanate, polyurethane is obtained. This is an elastic polymer compound, the molecule of which consists of many repeating fragments. If, during the chemical reaction, while the polyurethane has not hardened, a foaming agent is added to it - water or freon, then polyurethane foam is obtained. Cavities filled with gas are formed in the polyurethane. It increases in volume and retains heat better. In general, polyols are called polyhydric alcohols, that is, compounds that contain more than one hydroxyl group [–OH].