EI 421


Determination of evaporation loss of lubricating oils using the Noack evaporative testerThe Energy Institute / 01-Jan-2005 / 15 pages

Scope This standard specifies two alternative procedures for the determination of the evaporation loss of lubricating oils. The first procedure (Method A) is based on apparatus, either manual or automated, that contains Wood's metal in a recess containing the crucible, and the second procedure (Method B) is based on an automated apparatus not containing Wood's metal. The precision of the first procedure is applicable to evaporation losses in the range of 4,0 %(m/m) to 26,6 %(m/m), although test results outside this range may also be valid. The precision for the second procedure, applicable to the same range of results, is not finalized, but initial indications are that it is equal or better than that applicable to Method A. This standard is technically equivalent to CEC L-40-A-93.
The evaporation loss of lubricating oil is particularly important in engine oils, where high temperatures may lead to increased oil consumption and changes in lubricant performance. A control on evaporation loss by this, or similar test methods, is frequently included in engine oil specifications.
This standard is not suitable for testing extremely viscous materials, such as additive packages, as their slow heat transfer rate could lead to local overheating resulting in eruption of the material from the crucible or test cup.
Noack results determined using procedures A and B show consistent differences. Procedure A gives slightly lower results versus Procedure B on formulated engine oils, while Procedure A gives higher results versus Procedure B on basestocks.

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