Performance Lubricants
NRT Series for Reactive Gas Service

Product Information
The NRT series of Krytox™ oils and greases deliver nonreactive, nonflammable, long-lasting performance, evenunder the demanding temperatures and pressures ofreactive gas service. Krytox™ NRT lubricants are compatible
with oxygen and other reactive chemicals, and are extremely
resistant to water washout. Krytox™ 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
non-oxidizing nature of the oils makes the greases lastlonger. 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 uniquepolytetrafluoroethylene (PTFE) with the formula(CF2-CF2)n. This special high efficiency thickener has amelting point of 325 °C (617 °F), low molecular weight,and submicron (0.2 µm) particle size.
Krytox™ NRT 8904 and NRT 8906 provide excellent
lubrication options for valves, regulators, seals, andpump and motor bearings at a wide range of operating
conditions.
Krytox™ NRT 8906A provides rust protection at ambient
temperatures, corrosion protection at high temperatures,
and antiwear protection. This white grease, containing
a patented soluble anti-corrosion additive, is designed
for bearing applications where anti-corrosion protection
is required.

Krytox™ NRT 8908 grease is a special high-pressure
oxygen paste with excellent lubrication over a broad
temperature range. This product has been formulatedwith special oils and thickeners for use in the highpressure oxygen industry. Krytox™ NRT 8908 received arating of 350 bar at 60 °C (140 °F) in the BAM oxygen
reactivity test, making it a great choice for valves in highpressure service.
Krytox™ NRT 8950 is an extreme high-temperature grease
with low oil evaporation. The special non-melting hightemperature thickener in Krytox™ 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. Thegrease is slightly tacky and will provide extra bonding tothe surface. Krytox™ NRT 8950 received a rating of 180
bar at 60 °C (140 °F) in the BAM oxygen reactivity test.
Krytox™ NRT 8990 is a linear PFPE grease providing
low volatility characteristics for longer lubricant life. Thebase oil has a high viscosity index to provide effective
lubrication over a wider temperature range, making it agreat choice for liquid oxygen service. Krytox™ NRT 8990
is formulated using a patented soluble anti-corrosion
additive that helps reduce noise, rusting, and wear; thus,extending grease, bearing and component life.
Krytox™ NRT PLSS is recommended for use inapplications requiring an H-1 rated lubricant.
Krytox™ NRT 8805 is a clear, colorless oil for use invacuum pumps and oxygen compressors. It has been
precisely distilled to provide low vapor pressures andsuperior performance when compared to conventional
vacuum pump oils, which may cause safety, waste
disposal, and maintenance problems. Krytox™ NRT 8805
also contains a patented soluble additive to offer anti-rustprotection and improved performance properties.

Performance Lubricants

Krytox™

Product Properties of Krytox™ NRT Series
TypicalProperties
Description

NRT
8904

NRT
8906

NRT
8906 A

NRT8908

NRT8950

NRT8990

NRT
PLSS

NRT
8805

White, creamy White, creamy White, creamy Light gray, creamy White, creamy White, creamy White, creamy Clear, colorlessgreasegreasegreasepaste
greasegreasegreaseoil

NLGI Grade2222

1.5

12—

Thickener

PTFE

PTFE

PTFE

Inorganic

Non-melting

PTFEPTFE—–51–179(–60–354)–36–260(–33–500)–36–200(–33–392)–40–180(–40–356)–15–325(5–617)–75–150(–103–302)–36–260(–33–500)–40–160(–40–320)

60
9240
25
4240
25
4

49
7.2

500
47

15
3.7

240
25
3.9

81
11

1.93

1.95

1.95

2.0

1.95

1.9

1.95

1.9

1
<51
<62

8

1<51

Estimated UsefulTemperature
Range, °C (°F)
Oil Viscosity,
kinematic cSt,
ASTM D445,°C (°F)
40 (104)
100 (212)204 (399)
Oil Density, g/mL
Max. Oil Volatility,% in 22 hr,
ASTM D972,°C (°F)66 (151)
121 (250)
204 (399)
260 (500)

1
3

<12.1

The information set forth herein is furnished free of charge and based on technical data that Chemours believes to be reliable. It is intended for use by persons having technical skill, at their own
discretion and risk. The handling precaution information contained herein is given with the understanding that those using it will satisfy themselves that their particular conditions of use present
no health or safety hazards. Because conditions of product use are outside our control, Chemours makes no warranties, express or implied, and assumes no liability in connection with any useof this information. As with any material, evaluation of any compound under end-use conditions prior to specification is essential. Nothing herein is to be taken as a license to operate under or arecommendation to infringe any patents.
NO PART OF THIS MATERIAL MAY BE REPRODUCED, STORED IN A RETRIEVAL SYSTEM OR TRANSMITTED IN ANY FORM OR BY ANY MEANS ELECTRONIC, MECHANICAL, PHOTOCOPYING, RECORDING OR OTHERWISEWITHOUT THE PRIOR WRITTEN PERMISSION OF CHEMOURS.

For product information, industry applications, technical assistance, or global distributor contacts, visit krytox.com or within the U.S. and Canada, call 1-844-773-CHEM/2436 or
outside of the U.S., call 1-302-773-1000.
© 2020 The Chemours Company FC, LLC. Krytox™ and any associated logos are trademarks or copyrights of The Chemours Company FC, LLC. Chemours™ and the Chemours Logo aretrademarks of The Chemours Company.
Replaces: K-17396-3
C-10395 (11/20)