Krytox

Krytox is a brand of high-performance synthetic lubricants and greases based on perfluoropolyether PFPE, developed by DuPont. The Krytox line encompasses fluorinated lubricants in liquid and semi-solid forms designed for operation in extreme temperatures, in vacuum, and in chemically aggressive environments. They are valued for chemical inertness, very low volatility, high thermal stability, and dielectric strength.

Krytox lubricants consist of PFPE backbones with fluorinated end groups, which gives them excellent resistance to most chemicals and very low vapor pressure. They exhibit low surface energy, high load-carrying capability, and long service life in demanding conditions. They are typically non-flammable and provide good lubrication over wide temperature ranges; in vacuum, they generate minimal outgassing. Decomposition at very high temperatures can occur, potentially releasing toxic gases, so operation above recommended limits is avoided.

The Krytox family includes PFPE-based oils and PFPE-based greases (often marketed as Krytox GPL greases and Krytox 100-series fluids). These products are used in aerospace and aviation components, vacuum systems and semiconductor equipment, bearings and gears in harsh environments, and electronics cooling and cryogenic devices. They are chosen for inertness, non-reactivity with chemicals, and excellent lubrication at high temperatures and under vacuum.

Krytox was developed in the mid-20th century by DuPont and has since become a widely used line of PFPE lubricants. The brand name remains associated with PFPE-based lubricants, supplied by DuPont and licensed manufacturers for specialized markets, including aerospace, vacuum, and electronics.