D2878

D2878-95
Standard Test Method for Estimating Apparent Vapor Pressures and Molecular Weights of Lubricating Oils

1.1 This test method provides a calculation procedure for converting data obtained by Test Method D-972, to apparent vapor pressures and molecular weights. It has been demonstrated to be applicable to petroleum based and synthetic ester lubricating oils, at temperatures of 395 to 535 K (250 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.

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