Invoil C vacuum pump oil (EMS)
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Invoil C vacuum pump oil (EMS)

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 obtainableNo need for cold trap.Good pumping speed.No corrosive deposits or vapours.Physical Properties of Apiezon Oil Type C (now Invoil C)

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°C 10-7
Boiling Point,°C @ 1 torr 225
Flash Point (open cup)°F 510
Pour Point(ASTM)°F 5
Density, g/mL @ 20°C 0.875
@ 40°C 0.863
Viscosity, kinematic,cS @ 20°C 283
@ 50°C 90
@ 100°C 10.6
Coefficient of Expansion per
°C over 20-30°C (ASTM) 0.00069
Thermal Conductivity Btu/in 0.96


INVOIL 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.

NOTE: Formerly Apiezon C oil

Updated: 04-06-2026
Code Pack Size Availability Price Updated: 04-06-2026
M1-C-00500-X 500ml No ETA $543.00 AUD

* Availability Explanation

X weeks – the estimated lead time, based on the average time taken previously to fill orders from this particular supplier. Lead times are from when we receive your order until when we fill your order. For delivery times, please see shipping information below.

In Stock – Plenty of stock on the shelf, ready to ship.

No ETA – our supplier has advised they cannot provide an accurate ETA. Generally there is some issue with supply, and it may be more than 6 months.