Assertion: lubricant's property | /r/HasProperty | the surface-activity
Facets:
Source sentences:
text: Surface-active organic sulfur compounds are most commonly classified as extreme-pressure (or EP) additives, but the present application is not limited to those compounds specifically identified as EP additives, as the essential properties are the surface-activity and the ability to act as a sulfur donor to the organo-molybdenum friction modifier.