Aerospace Grade Grease: formulated to resist corrosion and rust and for highly loaded gears and bearings to achieve superior load-carrying ability; safe in chemical and oxygen services; long-lasting; antiwear protection; provides radiation stability. Aerospace greases are formulated by combining Krytox 143 Aerospace Oil with a special high efficiency thickener Krytox 2000 PTFE with a melting point of 325°C (617°F).
DuPont™ Krytox® 143 series oils are clear, colorless, fluorinated synthetic oils that are nonreactive, nonflammable, safe in chemical and oxygen service, and are long-lasting. Krytox® is a perfluoropolyether (PFPE)—also called perfluoroalkylether (PFAE) or perfluoropolyalkylether (PFPAE) The polymer chain is completely saturated and contains only carbon, oxygen, and fluorine. On a weight basis, a typical Krytox® oil contains 21.6% carbon, 9.4% oxygen, and 69.0% fluorine.
Aerospace greases are available in three standard grades. Within each grade, greases are formulated with oils having various viscosities and vapor pressures.
All standard grades of grease are thickened with high efficiency PTFE, whose formula is (CF2-CF2)n. This special high efficiency thickener has a melting point of 325°C (617°F) and has low molecular weight and submicron (0.2 μ) particle size for higher performance in bearings.
Krytox® 240 series greases are white buttery greases with all of the same properties as our 143 series oils that they are made from, but they are in grease form.
Krytox® 250 series EP greases are black greases that contain molybdenum disulfide added as an extreme pressure additive for highly loaded gears and bearings.
Krytox® 283 series anticorrosion greases are white greases that contain sodium nitrite. These grades provide rust protection at ambient temperatures, corrosion protection at high temperatures, and antiwear protection.
DuPont™ Krytox® 240 AC, 240 AB and 240 AZ gr-1 greases now have NSF approval for incidental food contact (H-1) in and around food processing areas.