It is a functional film applied to commercial and residential building glass, made through magnetron sputtering or nano-ceramic technology. It has functions such as heat insulation (blocking 60%-90% of solar energy), UV protection (99% blocking rate), energy conservation and consumption reduction, and privacy protection. It can reduce the air conditioning load by up to 30%, extend the lifespan of the glass, and enhance safety (explosion-proof and shatter-proof). High-end products support low reflectivity, intelligent dimming or photovoltaic power generation integration, and are widely used in office buildings, hotels, hospitals and other scenarios, in line with the trend of LEED green building certification.