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Consist of esters or specially selected hydrocarbon fractions. They were developed for vapour-diffusion pump fluids:
- High purity, very low pressure, very stable.
- Pressures lower than 10-7 torr obtainable
- No need for cold trap.
- Good pumping speed.
- No corrosive deposits or vapours.
Physical Properties of Apiezon Oil Type C (now Invoil C)
|Diffusion Pump Oil||Type C|
|Vapour Pressure,torr @20 deg. C||10-7|
|Boiling Point, deg. C @ 1 torr||225|
|Flash Point (open cup) deg. F||510|
|Pour Point(ASTM) deg. F||5|
|Density, g/mL @ 20 deg. C||0.875|
|@ 40 deg. C||0.863|
|Viscosity, kinematic,cS @ 20 deg. C||283|
|@ 50 deg. C||90|
|@ 100 deg. C||10.6|
|Coefficient of Expansion per|
|deg. C over 20-30 deg. C (ASTM)||0.00069|
|Thermal Conductivity Btu/in||0.96|
INVOIL C (formerly APIEZON OIL C)
Obtains the highest vacuum pressure (10-7 torr) of the Apiezon oils without the need of a cold trap. Suitable for most diffusion pump applications, including in electron microscopes and in vacuum coaters. This is an economic and effective substitute for Santovac 5 fluid. It should be noted that the ultimate vacuum is dependent on a suitably high backing vacuum and the out-gasing of TEM film and column components. Consequently the ultimate vacuum attained with Invoil C (Apiezon C) is very close to the theoretically much superior Santovac 5.
This product is not hazardous and does not require an MSDS.
A safety data sheet is available at apiezon.com