Apiezon N Grease and Low Temperature
Apiezon N Grease is one of the most widely used low temperature vacuum greases. This is a specially formulated low temperature grease that exhibits crack-free performance characteristics at low temperatures while being able to withstand frequent cycling at low temperatures between -273°C and + 30°C.
Apiezon's low temperature N greases are hydrocarbon based and do not suffer from the creep problems traditionally associated with indium. It is able to fill micropores between adjacent surfaces, improving overall heat transfer across the surface area.
As a thermal coupling medium, Apiezon N Grease is important in any system where rapid cryogenic temperatures are required, such as coupled cooling systems, superconducting magnets, cryostats or temperature sensors. The low level of magnetic susceptibility also makes it a desirable material for superconductor fabrication applications.
Apiezon N Grease is also a satisfactory material for sensor mounting as it is soft at room temperature; it solidifies at low temperatures to allow sensor installation and removal without damage. Apiezon N Grease is used to improve thermal contact between the sample and sample boat, or between the sample boat and the cold head of a cryostat. This thermal contact grease ensures that the sample is at the lowest possible temperature to increase the sensitivity of the test.
Low vapor pressure is necessary for any vacuum sealing medium in order to achieve a good vacuum. Apiezon N greases exhibit a very low vapor pressure at ambient temperatures, this is further improved by reducing the temperature reaching the cryogenic region.
Apiezon N grease is widely used to ensure vacuum seals in vacuum lines, cold traps, and in electron microscope optics, ground glass fittings, stopcocks, taps, Schlenk lines and liquid helium hoses. It can also be used to improve O-ring seals.
Advantages of Apiezon N Grease for Freezing
Withstands thermal cycling between -273°C and +30°C temperatures
Increased thermal conductivity at liquid helium temperatures
No crack performance
Silicone free, high creep resistance
cost effective
easy to apply and remove
10 year shelf life
