The main function of vacuum grease is to act as sealing grease in glass systems and reactors, and it can also serve as lubricating grease for glass valves. Currently, Perfectlight Technology's Labsolar-6A Full Glass Automatic Online Trace Gas Analysis System, Labsolar-ⅢAG Online Photocatalytic Analysis System, and Labsolar-ⅣAI Online Photocatalytic Analysis System are glass systems. Suitable vacuum greases include DOW CORNING HVG high vacuum sealing silicone grease, Apiezon H high-temperature vacuum lubricating grease, and Apiezon L ultra-high vacuum lubricating grease.