XHT-S and XHT-SX

Performance Lubricants

Product Information
Krytox™ XHT-S and XHT-SX greases are special hightemperature greases with low oil evaporation that provide
long bearing life and are compatible with most elastomers
and plastics. These greases provide excellent lubrication
over a broad temperature range, but are designed
to work best at temperatures over 200 °C (400 °F).
Krytox™ XHT-S series greases are nonflammable, oxygencompatible, chemically inert, and provide extended
lubrication intervals and longer equipment life.
Typical Properties of Krytox™ XHT-S Series PFPE Grease*
XHT-S

XHT-SX

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
5≤1 x 10–9≤8 x 10–7≤1 x 10–4≤3 x 10–14≤1 x 10–9≤2 x 10–6

<1

<0.75

White, creamy
consistency

White, creamy
consistency

Specific Gravity at 0 °C (32 °F)

1.99

1.99

Food Contact Approval

None

NSF H-1

Vapor Pressure, torr
20 °C (68 °F) (Knudsen)
100 °C (212 °F) (Knudsen)
200 °C (392 °F) (Knudsen)
Maximum Volatility in 22 hr, %204 °C (400 °F)
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.

The Krytox™ XHT-S series greases are an extensionof the Krytox™ GPL 240 series and Krytox™ GPL 20X
series, but are designed to give higher performance inthe 204–302 °C (400–575 °F) range. Krytox™ XHT-Sseries greases should be used below 320 °C (608 °F),
where the polytetrafluoroethylene (PTFE) thickener
could begin to melt. The base oil is an extremely viscous
oil that provides good viscosity and lower evaporation
at high temperatures. Krytox™ XHT-S series greases
contain no additives, so they are used when a potential
for interaction between process chemicals and grease
additives exists.
Krytox™ grease is made to a standard NLGI grade 2. PTFE
is the standard thickener.
Typical Applications
Applications for these lubricants are generally of a criticalnature, such as when temperatures reach extremes thatconventional lubricants cannot handle. Krytox™ XHT-Sand XHT-SX greases are expected to be durable in highly
aggressive environments. Where failure of components is
not an option, because of durability, warranty, safety, lossof productivity, or downtime, Krytox™ lubricants are theideal choice in a wide range of industries and applications.

Krytox™

Performance Lubricants

Typical applications for Krytox™ XHT-S and XHT-SX
include:Krytox™ PFPE Oils and Greases• Paint plant conveyor bearings• Corrugator and paper machine bearings• Aluminum can manufacturing bearings• Welding machines• High temperature fans
• Textile equipment• 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• Valves

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

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-91818-4
C-10294 (11/15)