What is Krytox™?
Krytox™ is the Chemours brand name for a range PFPE Lubricants.
What components are within a grease lubricant?
Different types of greases are typically formulated with three grease components: base oil, thickener and additives.
- The base oil lubricates, reducing friction between moving surfaces; this is exactly the same role that the base oil plays in a lubricant oil.
- The thickener acts like a sponge; its job is to hold oil in reserve until needed to lubricate. The thickener responds to external forces such as movement, vibration or temperature as a trigger to release oil.
- The additives supplement the lubricating capability of the base oil, improving upon characteristics such as wear protection and rust prevention.
What is a PFPE fluorinated lubricant?
PFPE lubricants are highly engineered, fully synthetic fluoropolymer materials used as lubricants and coatings in the most extreme & critical lubrication applications. Fluorinated oils and greases offer the ultimate in lubricant performance exhibiting tenacious surface adhesion and wear resistance properties. PFPE lubricants like KRYTOX™ are offer a wide-range benefits to different industries and applications where conventional and other synthetic lubricants are not able to survive.
What Industries utilize PFPE lubricants like Krytox?
Krytox lubricants can be used in applications where nonflammability, oxygen compatibility, materials compatibility, high temperature stability, and resistance to aggressive chemicals are requirements. Some examples include:
- Automotive: Wheel bearing grease, CV joint grease, universal joint grease, fan clutch bearing grease, etc
- Aerospace: Fuel resistant grease, oxygen compatible grease, ventilation fan bearing grease.
- Pumps: Vacuum pump fluid for corrosive and hazardous service, bearing grease for chemical pumps
- Valves: Lubricant for valve stem packing, relief valve lubricant, O-ring lubricant, steam turbine control valves
- Pumps: Vacuum pump fluid for corrosive and hazardous service, bearing grease for chemical pumps, O-ring lubricant, barrier fluid between double mechanical seals
- Corrugating: H1-certified oils and greases; Bearings, etc
- Medical: Oxygen valves, polymer additives, mechanism lubrication
- Miscellaneous: Anti-seize lubricant, bolt thread lubricant, water purifier lubricant, self-contained breathing apparatus lubricant, cryogenic lubricant, vacuum system sealant,
Is on-going re-lubrication required once you begin using PFPE?
Re-lubrication of bearings may be required: typically every 1–3 months for corrugators, depending on the equipment operating temperature. For other applications, re-lubrication intervals can be from months to years or
potentially never in the case of sealed systems.
Are PFPE oils and greases hard to clean up?
The very characteristic that makes PFPE lubricants, like KRYTOX, work as well as it does, i.e., its inertness to chemical attack, also makes it insoluble in most common solvents and is why it cannot be washed out with water. A small amount of a fluorinated solvent such as Vertrel XF on a rag or towel will easily remove remaining traces of Krytox.
Can I mix PFPE lubricants with other lubricants?
The performance benefits of PFPE greases (such as Krytox) will not be achieved if \ mixed with a non-perfluoropolyether (PFPE) greases. The performance of the grease mixture will be limited by the properties of the non-PFPE grease in the mixture. Krytox grease will not react with the other grease, nor cause decomposition or any hazardous reactions. The mixing tests have shown that the mixture sometimes softens up by about one penetration grade when it is heated up. This normally will not be enough change to cause any significant problems.
A high-performance PFPE grease like Krytox will not stop the other lubricant from breaking down from heat and oxidation. It is likely that the additives in the hydrocarbon grease have coated the bearing surfaces, and the PFPE grease will not be able to adhere to the bearing—so most of it might get thrown out of the bearing.
What are the primary differences in PFPE oils and greases like Krytox™?
- Krytox XHTs have additional treatment to make them more thermally stable at temperatures over 300 °C (572 °F) and have very high viscosity to withstand the temperatures and provide adequate lubrication.
- Krytox aerospace oils have more strict volatility specifications and are a narrower distillation than GPL oils.
- Krytox vacuum pump fluids are distilled to give an excellent vapor pressure and are designed for specific OEM pumps.
- Krytox linear oils have a better viscosity index and operate over a wider temperature range.
- Krytox GPL oils are formulated to provide a cost effective base oil for industrial applications.
Are Krytox™ lubricants cost-effective?
Krytox™ lubricants are cost-effective across a wide range of applications. Due to their inert nature, Krytox™ lubricants provide a much longer usable life as compared to typical hydrocarbon oils and greases; and the longer usable life allows them to remain for considerable periods of time before needing to be replaced, if they are replaced at all. That translates to savings over time, both
by lowering the amount of lubricant purchased and any downtime incurred during re-lubrication.
How do I convert from my current lubricant to PFPE lubrication?
Before adding a PFPE lubricant like Krytox, all previous oils and greases should be removed. If left in the mechanism these residue lubricants can form carbon deposits at higher temperatures, which may accelerate mechanism failure. Use an appropriate solvent to clean-out all residual lubricant, chlorinated solvents should not be used as they can leave behind chlorine, which can cause premature corrosion. Thoroughly dry the area that Krytox will be applied prior to application of Krytox oils or greases.
What approvals and certifications do Krytox lubricants have?
Krytox lubricants have the following certifications:
- ISO 9001 Certified Quality Management System
- ISO 14001 Certified Environmental Management System
In addition, certain grades have the following approvals:
- MIL-Spec PRF-27617 approved grades for aerospace and aviation use
- NSF H-1 food grade lubricants approved for incidental food contact
- Independently tested and confirmed for LOX and GOX use by major oxygen manufacturers and certification authorities