scope:

This International Standard specifies a method for the determination of the foaming characteristics of lubricating oils at specified moderate temperatures. It is applicable to lubricants which may or may not contain additives to modify or suppress the tendency to form stable foams. The ratings used to describe the foaming tendency and/or stability are empirical.

NOTE 1 This method may be used to indicate potential problems in lubrication, cavitation and loss in systems where foam formation adversely affects equipment operation.