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evaporation
- Thread starter frim
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This is a double posting isn't it ? Evaporation rates are generally expressed in mg/(cm2.s).
Mineral oils may be regular or synthetic, inhibited or not. I wonder whether test method ASTM D2715 run under an air stream would be of help. I believe that given the low vapor pressure of the mentioned lube, evaporation rates would be very small when exposed to 150oF and 27.92 in Hg absolute pressure. The supplier would be a good source of information for a considered answer to your query.
Then one has other ASTM tests to verify the resistance of a lubricant to molecular breakdown or rearrangement when exposed to air, such as D943, D1313, D2212, D2272, D2446, D2893, D5763, D6224, D6514. There is no clear rationale for selecting a particular one. Publications speak of "life-limits" beyond 10,000 hours of continuous use for synthetics and regular inhibited oils at 150oF.
Again, the supplier would be a reasonable source of information on thermal stability.
I hope this posting is of some help.![[smile]](/data/assets/smilies/smile.gif "[smile] [smile]")
Mineral oils may be regular or synthetic, inhibited or not. I wonder whether test method ASTM D2715 run under an air stream would be of help. I believe that given the low vapor pressure of the mentioned lube, evaporation rates would be very small when exposed to 150oF and 27.92 in Hg absolute pressure. The supplier would be a good source of information for a considered answer to your query.
Then one has other ASTM tests to verify the resistance of a lubricant to molecular breakdown or rearrangement when exposed to air, such as D943, D1313, D2212, D2272, D2446, D2893, D5763, D6224, D6514. There is no clear rationale for selecting a particular one. Publications speak of "life-limits" beyond 10,000 hours of continuous use for synthetics and regular inhibited oils at 150oF.
Again, the supplier would be a reasonable source of information on thermal stability.
I hope this posting is of some help.
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