The tendency (usually desirable) of a channel to form when grease is worked in a bearing, leaving shoulders of unworked grease that serve as a seal and a reservoir of oil. Also the tendency of liquid lubricants and certain lubricating greases to form a plastic structure sufficiently strong to resist flow under gravitational forces at low temperatures. Similar, but not identical to, the pour point of liquid lubricants, channeling is measured with empirical tests such as Method 3456.2 in Federal Test Method Standard No. 791 (D).