|
Characteristics
|
Standard |
Description |
|---|---|---|
|
Viscosity |
DIN 51561 |
Measure for the inner friction of liquids |
|
ISO VG |
DIN 51519 |
Assignment of oils into viscosity classes |
|
Operating temperature |
|
Temperature range of the optimal performance |
|
Flashing point |
DIN ISO 2592 |
Lowest temperature at which the vapour-air mixture ignites through |
|
Solidifying point |
DIN ISO 3016 |
The lowest temperature at which the oil is still just capable of flowing |
When selecting a lubricating oil, the base oil is of decisive importance. Mineral oils, synthetic hydrocarbons (polyalphaolefins = PAO),
ester, polyglycols and silicone oils differ considerably in their physical properties and chemical characteristics.
|
Properties |
Mineral oils |
Synthetic |
Ester oils |
Polyglycol oils |
Silicone oils |
|---|---|---|---|---|---|
|
Density 20°C [g/ml] |
0,9 |
0,85 |
0,9 |
0,9 - 1,1 |
0,9 - 1,05 |
|
Solidifying point [°C] |
-40 -> -10 |
-50 -> -30 |
-70 -> -35 |
-55 -> -20 |
-80 -> -30 |
|
Flashing point [°C] |
< 250 |
< 200 |
200 -> 270 |
150 -> 300 |
150 -> 350 |
|
Oxidation resistance |
- |
+ |
+ |
+ |
++ |
|
Thermal stability |
- |
+ |
+ |
+ |
++ |
|
Compatible with plastics |
+ |
+ |
- |
type-dependent |
+ |
The miscibility of different oils is influenced considerably by the base oils and must be taken into account correspondingly when
selecting the lubricant.
