Лако-красочные материалы — производство

When pigmented coatings are used in outdoor conditions, light is not the only factor affecting film degradation. A range of other factors such as heat, moisture, rain, fumes and other industrial gases are responsible, to more or less of an extent, for performance of the coating. Weather fastness is the ability of a pigment-binder system to tolerate the combined effect of daylight and other phy­sicochemical factors of the outdoor environment. In the presence of light and other atmospheric factors, various photochemical pro­cesses take place, causing problems such as chalking, discoloration or loss of gloss. Weather fastness generally depends on chemical composition, structure, crystallography, particle size and shape of the pigment and on properties of the vehicle in which the pigment is incorporated.