1.1 ,This test method covers a calculation procedure for converting data obtained by Test Method D972 to apparent vapor pressures and molecular weights. It has been demonstrated to be applicable to petroleum-based and synthetic ester lubricating oils,2 at temperatures of 395 ,K to 535 ,K (250 ,°,F to 500 ,°,F). However, its applicability to lubricating greases has not been established.
Note 1: ,Most lubricants boil over a fairly wide temperature range, a fact recognized in discussion of their vapor pressures. For example, the apparent vapor pressure over the range 0 ,% to 0.1 ,% evaporated may be as much as 100 times that over the range 4.9 ,% to 5.0 ,% evaporated.