Dry Film Lubricants: Solid Film Coating Solutions
Learn about graphite, PTFE, and molybdenum disulfide dry film lubricants.
Introduction to Dry Film Lubrication
Dry film lubricants are solid materials applied as thin coatings that provide lubrication without liquid carriers. These coatings are essential where liquid lubricants cannot function effectively, including extreme temperatures, vacuum conditions, and radiation exposure.
Graphite-Based Dry Film Lubricants
Graphite provides excellent lubrication in humid environments and high temperatures up to 500°C. The lamellar structure provides excellent load-carrying capacity with coefficients of friction typically 0.05-0.20.
PTFE Dry Film Coatings
Polytetrafluoroethylene (PTFE) provides the lowest coefficient of friction of any solid lubricant (0.02-0.10). Maximum service temperature is approximately 260°C.
Molybdenum Disulfide (MoS2) Coatings
MoS2 excels in vacuum and high-load applications. Load capacities exceeding 250,000 psi are achievable. It is specified in over 40% of aerospace applications.
| Property | Graphite | PTFE | MoS2 |
|---|---|---|---|
| Coefficient of Friction | 0.05-0.20 | 0.02-0.10 | 0.03-0.15 |
| Max Temperature (°C) | 500 | 260 | 400 |
- Match lubricant to environmental conditions
- Consider load requirements and required film thickness
Frequently Asked Questions
Can dry film lubricants be applied over existing lubricants?
No, surfaces must be clean and free of oils, greases, and other lubricants before application.
