Invoil Oils (formerly known as Apiezon Oils)

Consists of esters or specially selected hydrocarbon fractions. They were developed for vapor-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 vapors

Physical Properties of Apiezon Oils

  Diffusion Pump Oils
  Type B Type BW Type C
Vapor Pressure,vtorr @20°C 10-6 10-6 10-7
Boiling Point,°C @ 1 torr 220 225 225
Flash Point (open cup)°F 470 480 510
Pour Point(ASTM) °F 15 10 5
Density, g/ml @ 20°C 0.872 0.882 0.875
@ 40°C 0.859 0.869 0.863
Viscosity, kinematic,cS @ 20°C 142 361 283
@ 50°C 49.3 98.1 90
@ 100°C 7.0 10.1 10.6
Coefficient of Expansion per °C over 20-30°C (ASTM) 0.00073 0.00070 0.00069
Thermal Conductivity Btu/in 0.91 0.89 0.96
Invoil Oil B

Good for small or large vapor diffusion pumps. Good pumping speed and high backing pressure. If a cold trap is used, oil B can obtain a higher vacuum than oil C does.

Products specifications
Attribute name Attribute value
Hazard Hazard - Requires an additional shipping cost.
Cat # Description MSDS Pack Price Quote Quantity
Cat #: 60720 Description: APIEZON OIL B Pack: 500 mL Price: $222.00 Add to Quote:
Cat #: 60722 Description: APIEZON OIL BW Pack: 500 mL Price: $292.00 Add to Quote:
Cat #: 60724 Description: APIEZON OIL C Pack: 500 mL Price: $292.00 Add to Quote: