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7. Other features
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Evaporation loss
This is the relative mass loss, expressed as a percentage, that a fluid sample undergoes when heated to a given temperature for a given time.
The test can be carried out in the presence or absence of an air current, according to a specified method.
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Residual carbon
When oil is heated in a crucible, under specific conditions and away from any flame, the oil vapors escape and, after a certain time, a so-called "residual coke" remains in the crucible, the size and appearance of which is an interesting characteristic of hydraulic fluid.
This characteristic accounts for oil's propensity to leave deposits on appliance walls...
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Other features
Behavior towards air: solubility of air in oil
References
Standardization. Specifications
Association française de normalisation AFNOR
http://www. boutique.afnor.fr/
- Hydraulic transmissions – Fluids – Measurement of mineral oil filterability. Classification number : E48-690 - NF E 48-690 - 12-90
- Liquid petroleum products – Vapour pressure – Part 2: Determination of absolute vapour pressure (AVP)...
Hydraulic fluid analysis methods
Table 1 shows the equivalences between the various standards recommended by European and American standards bodies.
The numbers in the table refer to the comments below.
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