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High-purity alumina (HPA) refers to alumina powder with a purity of 99.99% (4N) or higher, typically produced via aluminum alkoxide hydrolysis, ammonium aluminum sulfate thermal decomposition, or modified Bayer processes. It is a white powder consisting primarily of the α-Al₂O₃ phase, with a high melting point (approximately 2050°C), excellent electrical insulation, high-temperature resistance, corrosion resistance, and thermal shock resistance. Purity grades are designated by “N” number: 4N corresponds to 99.99% (total impurities ~100 ppm), 5N to 99.999% (~10 ppm), and 6N to 99.9999% (~1 ppm).