We provide 5N, 5.5N and 6N hydrogen chloride gas,and 5.5N chlorine gas. High-purity HCl and Cl2 gases serve the semiconductor, photovoltaic, LED, pharmaceutical industries. High-purity HCl applied in cleaning and etching processes of epitaxial wafers and chips, mediating the growth of epitaxial films, removing surface oxides and etching metallic thin films. High-purity chlorine gas applied in cleaning and etching processes of epitaxial wafers, display panels, optical fiber, chips