Membrane technology uses salt water and electricity to produce chlorine, caustic soda and hydrogen between electrodes with a proton exchange membrane separator. Among the three different chlor-alkali production technologies, the ion membrane method is the most modern, with lower energy consumption and higher purity of the produced caustic soda, and has become the only technology adopted by new plants. In the past twenty years, BLUESTAR has developed highly innovative and excellent performance ion membrane cell technology (BS sixth generation and BS-BiTAC) in cooperation with thyssenkrupp Electrolysis GmbH and then with its joint venture tkUCE. At the same time, BLUESTAR has also developed the world's leading anode and cathode coating patent formula, which can withstand the high current density of modern ion membrane electrolytic cells, and has excellent performance in terms of voltage reduction (reduced energy consumption per unit), gas and caustic soda quality, and service life.