Evaporazione di grassi lubrificanti

ASTM D972

Standard Test Method for Evaporation Loss of Lubricating Greases and Oils
This test method covers the determination of the loss in mass by evaporation of lubricating greases and oils for applications where evaporation loss is a factor. Evaporation loss data can be obtained at any temperature in the range from 100 °C to 150 °C (210 °F to 300 °F).

ASTM D2878

Standard Test Method for Estimating Apparent Vapor Pressures and Molecular Weights of Lubricating Oils
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.

IP 183

Determination of evaporation loss of lubricating grease
This Standard describes a test procedure for the determination of evaporation loss of lubricating greases under prescribed conditions. The results may be used to indicate the degree of volatile matter present in lubricating grease but no correlation with field service has been established.

 

 


Bagno a secco per evaporazione di grassi

ASTM D2595

Standard Test Method for Evaporation Loss of Lubricating Greases Over Wide-Temperature Range
A weighed sample of grease in an evaporation cell is placed in a heating device maintained at the desired test temperature. Heated air is passed over the grease surface for 22 h ± 0.1 h. The loss in weight of the sample due to evaporation is determined.
This test method covers the determination of evaporation loss of lubricating greases at temperatures between 93 °C and 316 °C (200 °F and 600 °F). This test method is intended to augment Test Method D972, which is limited to 149 °C (300 °F).

 

 

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