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Krytox™ 240AC Grease

MIL-PRF 27617 Type III Grease, based on pure PFPE oil and high efficiency PTFE Thickener.




Product Overview

Krytox™ 240AC is a white buttery grease that is nonreactive, nonflammable, safe in chemical and oxygen service, and is extremely long-lasting. Meets MIL-PRF-27617 Type III.

Product Specifications

Viscosity (cSt):
@20°C (68°F): 800
@ 38°C (100°F): 270
@ 99°C (210°F): 26
@ 204°C (400°F): 4.1
Vapor Pressure of Base Oil:
@ 38°C (100°F): 8 x 10 e -8
@ 260°C (500°F): 2 x 10 e -3
Volatility of Base Oil (wt% loss in 22 hr.):
@ 149°C (300°F): 0
@ 204°C (400°F): <1
@ 260°C (500°F): 4
Pour Point of Base Oil: -35°C (-30°F)
Texture: Buttery
NLGI Grade: 2
Mechanical Stability (ASTM D217 10,000 and 100,000 strokes): No change
Oxidation Stability @ 99°C (210° F): 0 psig pressure drop after 600 hr
Liquid Oxygen Impact (ASTM D2512, NASA MSFC 106B): Pass
Grease Density (at 25°C/77°F): 1.93 g/mL
Oil Separation (wt% loss in 30 hours):
@ 99°C (210°F): 3
@ 204°C (400°F): 11
Estimated Useful Range: -34°C to 288°C (-30°F to 550°F)
Qualification Reference Number: AFPET/PTP 08-012
MIL-Spec: MIL-PRF-27617 Tyler 2
NATO Number: G-398
Change in Worked Penetration: +3
Corrosion on Copper (2b max): 1b
High Temperature Bearing Performance (500 hr min at 10,000 rpm, 204°C): Stopped at 1,320 hr
Evaporation % (ASTM D-2595): 10.1
Solubility in Fuel (%): 0.3
Water Washout Characteristics (%): 0.25
Dirt Count:
75 micron and larger: 0
25-75 micron: 0
Resistance to Aqueous Solution:
Distilled Water: Pass
50/50 Distilled Water/Ethanol: Pass
Film Stability and Corrosion on Steel: Pass
Primary Chemistry: PFPE

Features & Benefits

Chemically Inert
Broad temperature performance
Low out-gassing
Meets the following specifications:
MIL-PRF-27617 Type III
Nato # G-399
NSF H-1 Food Grade
-National Stock Numbers (NSN):


Bearings, gears, seals, o-rings, gauges, valves, gaskets, and quick connectors

Related Products

Krytox™ Greases

Krytox™ greases are nontoxic lubricants that maintain their lubricity and viscosity properties to reduce maintenance costs associated with re-lubrication, component failure, and downtime in demanding applications. They are created by thickening synthetic perfluoropolyether-based oil (PFPE) with polytetrafluoroethylene (PTFE) powder.

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