Krytox™ 240AC Grease

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 hrs):
@ 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
Grease density at 25°C (77°F): 1.93 g/mL
Military specification (MIL-SPEC): MIL-PRF-27617
NATO number: G-398
Change in worked penetration: +3
Corrosion on copper (2b max): 1b

Mechanical stability (ASTM D217, 10,000 and 100,000 strokes): No change
Oxidation stability @ 99°C (210°F): 0 psig pressure drop after 600 hrs

Liquid oxygen impact (ASTM D2512, NASA MSFC 106B): Pass
Oil separation (wt% loss in 30 hrs):
@ 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

High-temperature bearing performance (500 hrs, min at 10,000 rpm, 204°C): Stopped at 1,320 hrs

Evaporation % (ASTM D2595): 10.1
Solubility in fuel (%): 0.3
Water washout characteristics (%): 0.25

Dirt count:
75 microns and larger: 0
25–75 microns: 0

Resistance to aqueous solution:
Distilled water: Pass
50/50 Distilled water/ethanol: Pass
Film stability and corrosion on steel: Pass
Primary Chemistry: PFPE