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The electromagnetic flowmeter is one of the most popular products in industrial measurement today. When using an electromagnetic flowmeter to measure the volumetric flow rate of liquids, it is not affected by parameters such as the liquid’s temperature, pressure, density, or viscosity; therefore, no correction calculations or parameter adjustments are required. Therefore, electromagnetic flowmeters are widely used in various sectors of industrial production such as chemicals, petrometallurgy, chemical fibers, and cement manufacturing. Advantages of electromagnetic flowmeters: extremely low pressure loss, wide measurement range, suitable for a broad range of industrial pipe diameters, high accuracy, and the ability to measure the flow rate of fluids such as acids, alkalis, salt solutions, water, sewage, corrosive liquids, as well as sludge, pulp, and paper pulp, with a conductivity of ≥5μs/cm. When measuring different media, there may be a certain degree of corrosivity, which necessitates considering the choice of lining material for an electromagnetic flowmeter. The lining is an important component of electromagnetic flowmeters. The proper selection of the lining material has a direct impact on the performance, operational stability, and lifespan of these flowmeters. So how should the lining material be chosen? The selection of the lining material for electromagnetic flowmeters should be based on the corrosiveness, wear resistance, and temperature of the medium being measured. Rigid/soft rubber can resist corrosion from mild acids and bases; it can withstand temperatures up to 65°C. Soft rubber has wear resistance. Polytetrafluoroethylene (PTFE) can resist corrosion from strong acids and bases with the exception of hot phosphoric acid, and it can handle medium temperatures of up to 130°C, but it lacks wear resistance. Polyurethane rubber oil has good wear resistance, but it is not resistant to acid and alkali corrosion; its temperature tolerance is also poor, with the medium temperature should be below 65°C.