Classification by purity is a key method for categorizing molybdenum foil, directly impacting its performance and applications. Molybdenum foil is typically divided into high-purity foil (≥99.95%), standard pure foil (99.0%-99.95%), and low-purity foil (<99.0%). High-purity foil, produced via advanced purification processes like electron beam melting, has minimal impurities (e.g., carbon, oxygen, iron), offering superior chemical stability, conductivity, and oxidation resistance. It is widely used in semiconductor manufacturing (e.g., sputtering targets), vacuum furnaces, and high-precision electronics, ensuring consistent performance and low defect rates. Standard pure foil contains trace impurities, with slightly reduced performance but lower cost, suitable for general high-temperature furnace components and chemical equipment. Low-purity foil, with higher impurity levels, is prone to grain boundary corrosion or brittleness, exhibiting poorer corrosion resistance and mechanical properties, typically used in low-demand applications like basic molds or structural parts. Higher purity enhances creep resistance, ductility, and surface quality, though protection is still needed in oxidizing environments above 600°C. In production, purity selection balances cost and performance: high-purity foil, though costly, suits precision applications; standard foil offers cost-effectiveness for general uses. Purity is verified using spectral or chemical analysis to meet standards. Classifying by purity helps users select appropriate foil based on environmental demands, such as high-temperature or corrosive conditions.
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