Graphite plate(graphite boat) adopts high-quality graphite material, adding organic compound with strong acid resistance. It is refined by high-pressure forming, vacuum impregnation, and high-temperature heat treatment. It has extraordinary acid and temperature resistance. It is an ideal lining material for phosphoric acid reaction tanks and phosphoric acid storage tanks in the chemical industry. The product has the characteristics of wear resistance, temperature resistance, pressure resistance, corrosion resistance, creep resistance, oil-free self-lubrication, small expansion coefficient, and superior sealing performance.