Apiezon® M grease has been specifically developed for vacuum use, but it can also be used in a variety of industrial and scientific applications. Apiezon® M is a low vapor pressure, hydrocarbon grease that is used in the high vacuum range. Apiezon® M grease resists the “creep” phenomenon, so it will not contaminate or interfere with analytical techniques such as IR and MS. The M grease is approved by the global industry NATO. Apiezon® M also contains built-in resistance to irradiation, and is better lubricant than ester silicones and halogenated paraffins, which decompose at levels of 10 Mrads or less. The complex structure and high molecular weight of Apiezon® M grease gives it strong absorption properties to be used as a stationary phase in gas chromatography. Apiezon® M grease is specifically formulated to maintain efficient gas seals in the high performance vacuum pump industry.
Similar to Apiezon® L with low melting point but contains more wax
Widely used as stationary phase in GC
Silicone and halogen free
High vacuum range
Apiezon® M grease has no contamination effect on electrical equipment and is easily removed through use of water, soapy water, hydrocarbon solvents (Limonene, Toluene, Xylene) or chlorinated solvents (Trichloroethylene). When Apiezon® M is removed, it also takes away trace impurities that are not removed by solvents alone.
Vapor Pressure (Torr)
@20°C: 1.7 x 10-9
@20°C: 0.194 (W/m °C)
Lubricity 4 Ball Test
Viscosity of Molten Grease
@50°C, 413 (cSt) @100°C, 29.8(cSt)
Coeff. of Expansion
20°C-30°C: 0.00075 cm/°C
2.6 x 1016 (ohm cm)
Surface Breakdown at Flash Over
As shown below, Apiezon® M grease has low vapor pressures at ambient temperatures so it may be used at high vacuum ranges. Apiezon® M has the highest vapor pressures based off of L, M, and N greases, with vapor pressures below 10-9 torr at ambient temperatures (20 °C).
Apiezon M Vapour Pressure
Chart:Apiezon M Vapour Pressure
It is strongly recommend using all fluids and greases at the time of receipt, however when storage is necessary, rotate older stock into use first and observe the recommended parameters listed below.
All Apiezon products have a shelf life of 10 years if unopened in their original container and stored at ambient temperatures. If the product has been opened, resealed and then stored in clean, dry, dark environment under ambient conditions in the original container, it should last up to 10 years, but this is not guaranteed.