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Specialized Hydrocarbon-based grease for cryogenic applications
Apiezon N is a specialty grease for various cryogenic uses, including for vacuum sealing at very low to warm temperatures where its vapour pressure is very low, making it suitable for high vacuum applications. Type N does not craze or crack at low temperatures, has good thermal conductivity at low temperatures and is ideal for mounting sensors and other devices. It has very low levels of magnetic susceptibility which makes it suitable for some superconductor applications. Cycling between absolute zero and +40 deg. C is well tolerated by Apiezon , N. It is frequently used as a jointing medium on cryostat flanges where its larger contact area, compared with that of indium wire, provides much better thermal transfer. Applications include cryo-systems on electron microscopes, cryostats, magnetic image resonance systems, sealing of vacuum parts including glass joints and as a heat sink.
There are many types of grease currently available, such as PFPE based products that quote operating temperatures well below 0 deg. C. However, nearly all these products have a quoted operating temperature range limit of -80 deg. C. Typical heat sink compounds are only quoted as working down to -50 deg. C. The one exception is hydrocarbon based grease (with proprietary additives) which can operate all the way down to -269 deg. C, the temperature at which liquid helium boils.
Apiezon products:
Typical Property AP101 AP100 H L M N T Main area of
application General Lubricating Cryogenic High Temp High Vacuum General Vacuum Medium Temp Melting Point:
ASTM.D 566 °C
°F >,200
>,392 42-52
108-126 does not melt 42-52
108-126 40-60
104-140 42-52
108-126 112-137
233-278 Working temp. range °C
°F -40-180
-40-365 10-30
50-86 -10-240
14-464 10-30
50-86 10-30
50-86 -269-30
-452-86 10-120
50-248 Vapor Pressure
Torr @20°C <,1.0×10-5 7.0×10-11 1.7×10-9 7×10-11 1.7×10-9 6×10-10 4.6×10-9 Relative Density 20°C 0.981 1.042 0.918 0.896 0.894 0.911 0.912 Radiation Resistance No No No Yes Yes No No Outgassing
Characteristics
ASTMS .E
595-90 TML
CVCM —
— <,1.0%
<,0.1% <,1.0%
<,0.1% <,1.0%
<,0.1% —
— <,1.0%
<,0.1% —
— Lubricity 4 Ball Test
ASTM .D 2763
(IP 239), Kg 450 450 250 150 140 150 — Viscosity of molten
grease, cP 50°C
100°C —
— —
— —
— 766
62.3 413
29.8 —
— —
— Coefficient of
expansion per °C
over 20°C-30°C 0.00066 — — 0.00076 0.00075 0.00072 0.00073 Thermal conductivity,
w/m°C —
— —
— —
— 0.216
— 0.194
— 0.194
0.095 —
— Latent heat of fusion,
cal/g — — — 15.1 18.7 15.0 — Fusion Peak °C — — 25 32 34 31 * Vol. resistivity, cm — — — 1.2×1016 2.6×1016 2.0×1016 3.3×1012 Permittivity — — — 2.3 2.1 2.3 2.3 Loss tangent — — — <,0.0001 <,0.0001 <,0.0001 <,0.0001 Surface breakdown
at flash over, kV — — — 24 28 27 24 Electric strength, V — — — 730 850 820 730
Технические характеристики
Main area of
application
