Braycote 601EF High Vacuum Grease

Braycote 601EF High Vacuum Grease, 1 Pound (454 g)
Size 1 Pound (454 g)
AvailabilityContact for Availability
Braycote 601EF High Vacuum Grease, 10g (Cert of Conformance not available)
Size 10 g
AvailabilityIn Stock
Braycote 601EF High Vacuum Grease, 2oz.(56g)
Size 2 oz (56 g)
AvailabilityIn Stock
Braycote 601EF High Vacuum Grease, 4oz.(113g)
Size 4 oz (113g)
AvailabilityIn Stock
Braycote 601EF High Vacuum Grease, 1.75 Pounds (794 g)
Size 1.75 Pounds (79
AvailabilityContact for Availability

Please note: No Certification of conformance available for 05086-BA

Braycote® 601EF High Vacuum Grease

The Braycote® 601EF high performance vacuum grease has been reformulated for manufacturing under more "environmentally friendly" circumstances and therefore carries the "EF" next to the product designation. Virtually all users should find the new 601EF to be indistinguishable from the original Braycote 601. Be sure you are familiar with the broader range of these unique fluorocarbon based grease products for vacuum applications.

In an earlier lifetime......

Before this product was known as Braycote 601 or 601EF, it was known as Braycote 3L-38RP which was the name was from an old NASA double blind test on lubricant performance.

Braycote® 601EF features excellent resistance to fuels and oxidizers. It has a useful temperature range of (-80°C/-112°F to +204°C/399°F) and it also features good low torque capabilities.

Corrosion preventative present:

Braycote 601EF contains sodium nitrite as a corrosion preventative. Braycote 600EF does not contain this corrosion preventative and this is probably the biggest difference between 600EF vs. 601EF. We point this out for those intending use in environments that should be "sodium free". If your application requires a sodium free grease, we would recommend Braycote 600EF or Braycote Micronic 1613 which do not have such an additive present. The Braycote Micronic 1613 has the smallest particle size of the PTFE thickener and might be more desirable for some applications for that reason.

Some other characteristics:

Typical evaporation Weight Loss, %: 0.52 (30 hours at 204°C/399°F) as determined by ASTM E595 Outgassing Test. The specification is for a Total Mass Loss of 1.0% or less and a Collectible Volatile Condensable Material of 0.1% or less.

Base Oil
Vapor Pressure (torr)

20°C 4x10-13
100°C 3x10-9
Viscosity at -40°C/-40°F: 6500 cSt

Oxygen Index

LOX Pass and Oxidation Bomb Test results using ASTM D942 at 100° C:
Pressure drop:

1 psi at 100 hours
4 psi at 500 hours

Thermal Conductivity:

-35° C 0.15 W/m K
75° C 0.21 W/m K

Vacuum Stability Test:

Per E595 NASA SP-R-0022A
24 hours, 125°C (257°F), 10-6 torr
Total Weight Loss (TWL), % wt. 0.39
Volatile Condensable Material (VCM), % wt. 0.03


The product is compatible with most plastics, metals and rubbers. Extensive information is available about chemical resistance to various chemical species for perfluoroether lubricants, but not specifically for Braycote 601EF.

MIL-Spec Status:

Braycote 601EF at the present time does not comply with any specific MIL-Spec.

However, as is always the case when selecting a vacuum grease, you have to do your own testing to make certain that would be the correct situation in your specific case.

NGLI Grade: 2

Removal of unwanted grease from grease applied surfaces:

The composition of this product is a mixture of small PTFE particles (which won't dissolve in anything) and a perfluorinated polyether liquid. We have found that Castrol® Fluoroclean™ HE is an effective solvent for the liquid component of the formulated composition and aids in the removal of the grease from places where it is no longer needed or wanted.


Syringe-style packaging is used for 10g, 25g, 2 oz, and 4 oz; a jar is used for 7 oz and 1 pound; and a tube (for gun type dispensing) is used for the 1.75 pound container.