Krytox® XHT-BD, XHT-BDX, and XHT-BDZ

PRODUCT INFORMATION
DuPont™ Krytox® XHT-BD series oils are special extreme high 
temperature greases with low oil evaporation and are thickened 
with a non-melting thickener to allow use at temperatures above 
the melting point of common greases. They have excellent 
lubrication over a broad temperature range. Krytox® XHT-BD 
series greases are nonflammable and chemically inert. Krytox®
allows extended lubrication intervals and longer equipment life. 
Krytox® XHT-BD greases are designed for use where the 
temperatures are in the 288 °C (500 °F) range and higher, where 
there is a danger of melting the standard PTFE thickener. This 
grease uses a special non-melting high temperature thickener. 
The base oil is an extremely viscous oil that provides good 
viscosity and lower evaporation at high temperatures. Krytox®
XHT-BD greases are for use in low speed bearings or in pillow 
housings and will shear at high speeds, causing loss of oil 
in sealed bearings. The oil in the grease can begin to slowly 
evaporate at temperatures above 330 °C (626 °F) and this will 
occur at an increasing rate as temperatures increase. 
Relubrication could be required at these temperatures to 
achieve optimum life.
Compatibility with Metals
Due to their low surface tensions, Krytox® oils easily wet 
metallic surfaces and because of their inertness, Krytox® oils 
have little or no adverse effect on metals. Testing of metals 
at 340 °C in the absence of air has shown little evidence of 
corrosion. In the presence of air, corrosion was slightly higher. 
The presence of molybdenum in the metals improved 
corrosion resistance. 
Typical Properties of XHT-BD Series PFPE Grease*
XHT-BD XHT-BDX XHT-BDZ
Standard NLGI Penetration Grade 1.5 1.5 1.5
Estimated Useful Range
°C (°F) –20/300 (–4/572) –15/350 (5/662) –5/360 (23/680)
with spikes to with intermittent spikes to with intermittent spikes to
 330 °C (626 °F) 400 °C (752 °F) ≥400 °C (≥752 °F)
Pour Point –25 °C (–13 °F) –20 °C (–4 °F) –15 °C (5 °F)
Base Oil Viscosity, cSt
20 °C (68 °F) 1,712 2,610 3,500
40 °C (104 °F) 500 738 1,023
100 °C (212 °F) 47 65 88
Oil Separation in 30 hr at 99 °C (210 °F), % 6 5 5
Oil Volatility in 22 hr at 260 °C (500 °F), %, D2595 2.1 1.5 1.1
Vapor Pressure
20 °C (68 °F) (Knudsen) ≤1 x 10–9 ≤3 x 10–14 ≤4 x 10–15
100 °C (212 °F) (Knudsen) ≤8 x 10–7 ≤1 x 10–9 ≤2 x 10–10
200 °C (392 °F) (Knudsen) ≤1 x 10–4 ≤2 x 10–6 ≤3 x 10–7
Appearance White, White, White,
creamy consistency creamy consistency creamy consistency
Specific Gravity at 0 °C (32 °F) 2.00 2.00 2.00
* This table gives typical properties (not specifications) based on historical production performance. DuPont does not make any express or implied warranty that these products will 
continue to have these typical properties.