Boundary Lubricant prevents metal-to-metal contact.

Suitable for high-end manual chucks or power chucks, HPG500 Lubricant prevents metal-to-metal contact under high load and slow speed conditions. NLDI Grade 2 lubricating grease offers optimized water

[source: http://news.thomasnet.com/fullstory/Boundary-Lubricant-prevents-metal-to-metal-contact-20013861]