Manganese Dioxide

Battery-grade and electrolytic manganese dioxide (EMD) are the commercially dominant forms under this heading, serving as a critical cathode material in alkaline and lithium-primary battery manufacturing. All US imports are classified under a single tariff line, 2820100000. Colombia and Brazil lead supply to the US, with Japan also a notable source of high-purity electrolytic grades. Importers sourcing battery-grade material should pay close attention to purity specifications and certificate-of-analysis requirements, as end-use performance is highly sensitive to trace impurity levels.