Coated glass is also called reflective glass. Coated glass is coated with one or more layers of metal, alloy or metal compound film on the surface of glass, in order to change the optical properties of glass and meet certain specific requirements. According to different characteristics of products, coated glass can be divided into the following categories: heat reflecting glass, Low-E glass, conductive film glass, etc. Heat reflecting glass is generally coated with one or more layers of metal or its compound film such as chromium, titanium or stainless steel on the surface of glass, which makes the product rich in color. It has appropriate transmittance for visible light, high reflectivity for infrared and high absorption rate for ultraviolet. Therefore, it is also called sunlight control glass, which is mainly used in buildings and glass curtain walls; Low emissivity glass is a thin film system composed of multi-layer silver, copper, tin and other metals or their compounds on the surface of glass. The product has high transmittance to visible light, high reflectivity to infrared ray, and good heat insulation performance. It is mainly used in building, automobile, ship and other communication tools. Due to the poor film strength, it is generally made into hollow glass; Conductive film glass is coated with indium tin oxide and other conductive films on the glass surface, which can be used for heating, defrosting, defogging and liquid crystal display.