Krytox
（重定向自Polyhexafluoropropylene oxide）
![Krytox fluoroether-based grease (left) is often used in laboratories, including in high-vacuum applications, due to its inertness. Pictured alongside a tube of Dow Corning silicone grease (green), also used in high-vacuum applications.](/Images/godic/202502/03/Laboratory_grease_14619.jpg")
Krytox is a group of colourless synthetic lubricants (oils and greases) with a variety of applications. Invented by researchers at DuPont, Krytox oils are fluorocarbon ether polymers of polyhexafluoropropylene oxide, with a chemical formula: F−(CF(CF3)−CF2−O)n−CF2CF3, where the degree of polymerization, n, generally lies within the range of 10 to 60. These compounds are collectively known by many names including perfluoropolyether (PFPE), perfluoroalkylether (PFAE) and perfluoropolyalkylether (PFPAE). A unique identifier is their CAS registry number, 60164-51-4.