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December 31, 2020
Extreme pressure is the ability of the lubricating film to bear load without being squeezed out of the friction surface, resulting in a lack of lubrication on the friction surface.
The extreme pressure of oil products can be measured by the four-ball method, more often by the Timken machine test method: the test ring is installed on a fixed spindle and rotates at a speed of 800r/min. Apply a load to the grinding block, test the oil for about 3L, and circulate it to the contact surface of the ring block. The maximum load value without scratches is called the OK value. For example, the OK value of extreme pressure lithium grease is 156N (Nine), or 351b (lb).
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