Krytox GPL Extreme Pressure 210–217 greases are black greases that contain molybdenum disulfide added as an extreme pressure additive for highly loaded gears and bearings.
Krytox GPL Extreme Pressure heavy-duty greases are used for high loading or slow speeds. EP greases have high load-carrying capability and good lubrication characteristics under boundary and mixed friction conditions. In addition to the EP additive in Krytox heavy-duty greases, Krytox oil provides adequate EP protection as an oil by itself, due to the viscosity build under load and its unique tribochemistry.
A common test for analyzing EP performance is the Timken EP method, ASTM D2509. The test is performed by applying pressure between a rotating steel cup and a steel block and simulates line contact conditions. Two conditions are observed; the OK Load is the highest load at which no seizing or welding occurs, and it also reflects the load-carrying capability of the lubricant. The Score Load is the lowest load at which seizing or welding is observed. The scar width, which is the average scar width at the load corresponding to the OK load valve, is also recorded. The Timken EP results for various Krytox greases can be seen in Table 1, Timken EP Method.