XHT-AC and XHT-ACX

Performance Lubricants

Product Information
Krytox™ XHT-AC and XHT-ACX greases are special hightemperature greases with low oil evaporation that provide
anti-wear and rusting protection, and are compatible withall elastomers and plastics. These greases have excellent
lubrication over a broad temperature range, but aredesigned to work best at temperatures over 200 °C (400°F). Krytox™ XHT-AC series greases are nonflammable,
oxygen-compatible, and chemically inert. Krytox™ greases
provide extended lubrication intervals and longer
equipment life.
Typical Properties of Krytox™ XHT-AC Series PFPE Grease*

The Krytox™ XHT-AC series greases are an extension of theKrytox™ 240 series and Krytox™ GPL 22X series, but aredesigned to give higher performance in the 204–302 °C(400–575 °F) range. Krytox™ XHT-AC series greases containsodium nitrite to offer anti-corrosion performance. Thesegreases should be used below 320 °C (608 °F), where thepolytetrafluoroethylene (PTFE) thickener could begin tomelt. The base oil is an extremely viscous oil that provides
good viscosity and lower evaporation at high temperatures.
Krytox™ grease is made to a standard NLGI grade 2. PTFE isthe standard thickener.
Typical Applications

XHT-ACXHT-ACX

Estimated Useful Range°C°F–20–300–4–572–10–300
14–572

Base Oil Viscosity, cSt
20 °C (68 °F)
40 °C (104 °F)
100 °C (212 °F)

1,712
500
47

2,610
738
65

Oil Viscosity Index

149

158

Oil Pour Point°C°F–25–13–15
5Anti-Rust Rating, ASTM D1743

Pass

Pass

Maximum Volatility in 22 hr, %204 °C (400 °F)<1<0.75

White, creamy
consistency

White, creamy
consistency• Welding machinesSpecific Gravity at 0 °C (32 °F)

1.99

1.99

Food Contact Approval

NSF H-1

NSF H-1• Textile equipment

Appearance* This table gives typical properties (not specifications) based on historical production
performance. Chemours does not make any express or implied warranty that theseproducts will continue to have these typical properties.

Applications for these lubricants are generally of a criticalnature, such as when temperatures reach extremes thatconventional lubricants cannot handle. Krytox™ XHT-AC
and XHT-ACX greases are expected to be durable in highly
aggressive environments. Where failure of components is
not an option, because of durability, warranty, safety, loss of
productivity, or downtime, Krytox™ lubricants are the ideal
choice in a wide range of industries and applications.
Typical applications for Krytox™ XHT-AC and XHT-ACX include:• Paint plant conveyor bearings• Corrugator and paper machine bearings• Aluminum can manufacturing bearings• High temperature fans
• Tenter frames• High temperature ovens• Conveyor systems in glass and aluminum plants• Textile calender roll bearings• Brick kiln car bearings• Valve lubrication• Ventilation fan bearing grease• Rod mills

Krytox™

Performance Lubricants

Krytox™ PFPE Oils and Greases

Compatibility with Metals

Perfluoropolyether (PFPE) oils are clear, colorless,fluorinated synthetic oils that are non-reactive,
nonflammable, safe in chemical and oxygen service,and long lasting. Krytox™ oil is a PFPE—also called
perfluoroalkylether (PFAE) or perfluoro­polyalkylether(PFPAE)—with the following chemical structure:

Because of their low surface tensions, Krytox™ lubricants
easily wet metallic surfaces. Krytox™ lubricants are
chemically inert and, therefore, have no adverse effect on
metals when the temperature is below 288 °C (550 °F).
Above 288 °C (550 °F), many alloy steels, stainlesssteels, and other metals, such as aluminum alloy, titanium
alloy, nickel alloy, and cobalt alloy, can be used withKrytox™ lubricants.

F-(CF-CF2-O)n-CF2CF3|
CF3

where n = 10–60

The polymer chain is completely saturated and contains
only carbon, oxygen, and fluorine. On a weight basis, atypical Krytox™ oil contains 21.6% carbon, 9.4% oxygen,and 69.0% fluorine.

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.
© 2015 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: H-91814-4
C-10293 (9/15)