Krytox® NRT Series Lubricants for Reactive Gas Service

PRODUCT INFORMATION
The NRT Series of DuPont™ Krytox® oils and greases deliver 
nonreactive, non-flammable, long-lasting performance even 
under the demanding temperatures and pressures of reactive 
gas service. NRT lubricants are compatible with oxygen and 
other reactive chemicals and are extremely resistant to water 
washout. NRT lubricants are also compatible with polymers 
used in seals, O-rings and valves.
The superior film-forming capability of Krytox® lubricants 
provide a thick oil layer that reduces friction and wear, extending 
equipment life in severe duty applications. The nonoxidizing 
nature of the oils makes the greases last longer. The oils don’t 
gum up as they age, so they won’t harden the greases and 
cause catastrophic failure. 
Krytox® oils and greases are perfluoropolyether (PFPE) 
lubricants — also called perfluoroalkylether (PFAE) 
or perfluoropolyalkylether (PFPAE). Many of the NRT 
series of Krytox® greases are thickened with a unique 
polytetrafluoroethylene (PTFE) with the formula (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 µm) particle size.
NRT 8900 grease has been formulated for use in cold to 
ambient conditions, and is recommended as a cost-effective 
valve packing and seal lubricant for O-rings.
NRT 8904 and 8906 provide excellent lubrication options for 
valves, regulators, seals, and pump and motor bearings at a 
wide range of operating conditions. 
NRT 8906A provides rust protection at ambient temperatures, 
corrosion protection at high temperatures, and antiwear 
protection. This white grease, containing a patented soluble anticorrosion additive, is designed for bearing applications where 
anti-corrosion protection is required.
NRT 8908 grease is a special high-pressure oxygen paste 
with excellent lubrication over a broad temperature range. This 
product has been formulated with special oils and thickeners for 
use in the high-pressure oxygen industry. NRT 8908 received 
a rating of 350 bar at 60 °C in the BAM oxygen reactivity test, 
making it a great choice for valves in high pressure service.
NRT 8950 is an extreme high-temperature grease with low oil 
evaporation. The special non-melting high temperature thickener 
in NRT 8950 also provides extreme pressure properties and 
works as a solid lubricant if the base oil is depleted. The base 
oil provides good viscosity and lower evaporation at high 
temperatures. The grease is slightly tacky and will provide extra 
bonding to the surface. NRT 8950 received a rating of 180 bar at 
60 °C in the BAM oxygen reactivity test.
NRT 8990 is a linear PFPE grease providing low volatility 
characteristics for longer lubricant life. The base oil has a high 
viscosity index to provide effective lubrication over a wider 
temperature range, making it a great choice for liquid oxygen 
service. NRT 8990 is formulated using a patented soluble anticorrosion additive that helps reduce noise, rusting, and wear, 
thus extending grease, bearing and component life.
NRT PLSS is recommended for use in applications requiring 
an H-1 rated lubricant. 
NRT 8805 is a clear, colorless oil for use in vacuum pumps 
and oxygen compressors. It has been precisely distilled to 
provide low vapor pressures and provide superior performance 
when compared to conventional vacuum pump oils which may 
cause safety, waste disposal, and maintenance problems. 
NRT 8805 also contains a patented soluble additive to offer 
antirust protection and improved performance properties.