QC Lubricants
7360 Milnor St • Philadelphia, PA 19136
(215) 333-4187 Direct Line

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With Extension: (800) 887-2436
For Technical Assistance: Dial Extension 203 for Stan Jakubowski
For Sales Assistance: Dial Extension 211 for Lu Ann Quinn or 224 for Lindsay Romero


We actively supply a comprehensive line of MIL-SPEC and commercial lubricants.

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Braycote 631 RP

Grease, Rust Preventive, Rocket Propellant Compatible Low Temperature

Brayco 631RP


Castrol Braycote 631RP is a smooth, buttery, off-white NLGI #2 grease based upon a perfluoroether oil. This grease is nonflammable and is in general chemically inert. It is thermally stable either alone or in the presence of oxygen, has exceptionally low volatility, and has little tendency to form deposits. In addition Braycote 631RP exhibits excellent lubricating properties, good dielectric properties, and shear stability. Castrol Fluoroclean™ X100 and Castrol Fluoroclean™ HE can be used to remove this lubricant. Refer to the data sheets for information regarding these products.

2 oz syringe, 1 lb can, 1.75 lb cartridge

Braycote 631RP Application:
Braycote 631RP is designed for static or dynamic service in the presence of fuels and oxidizers. It has been used in gears, ball and roller bearings, electrical contacts, and as a thread and elastomer sealant.
Braycote 631 RP is particularly useful as a lubricant in corrosive or oxygen (LOX/GOX) service and as a plug valve lubricant.
Braycote 631RP
is compatible with concentrated acids and bases and it does not hydrolyze or oxidize. Perfluorinated greases, such as Braycote 631RP, exhibit excellent shelf lives due to their inertness.

Braycote 631RP Typical Properties Braycote 631RP Braycote 631RP properties

CASTROL Braycote 631RP Additional Information:

Temperature Range:
-54ºC to above 204ºC (-65ºF to above 400ºF)

Braycote 631RP is only slightly soluble or insoluble in most current fuels and oxidizers in propellent service, and in most organic solvents and materials other than fluorinated solvents.
Braycote 631RP is compatible at normal operating temperatures with conventional metals, plastics and elastomers.
Braycote 631 RP may be adversely affected by Lewis Acids, such as aluminum chloride, at elevated temperatures. Newly exposed rubbing surfaces of aluminum, magnesium or titanium alloys may react with Braycote 631RP under certain conditions. Such systems should be thoroughly evaluated. Surfaces must be well cleaned of organic rust inhibitors prior to grease application to insure proper lubrication.
Braycote 631RP is not recommended for use in applications under vacuum and loads exceeding 100,000 psi for extended periods of time.

Health, safety and environmental information are provided for this product in the Materials Safety Data Sheet. This gives details of potential hazards, precautions and First Aid measures, together with environmental effects and disposal of used products. Castrol will not accept liability if the product is used other than in the manner or with the precautions or for the purpose(s) specified. Before using the product other than directed, please contact Castrol for consultation.

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