Oils

Oils dissipate heat well from the lubricating point. In addition they have a notedly good creep and wetting behaviour. Oil lubrication is therefore often used at high temperatures or high speeds. Typical fields of application are gears, chains, friction bearings, hydraulic systems and compressors.

 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
extraneous ignition

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
hydrocarbons (PAO)

Ester oils

Polyglycol oils

Silicone oils

Density 20°C [g/ml]
approx.:

 0,9

 0,85

 0,9

 0,9 - 1,1

 0,9 - 1,05

Solidifying point [°C]
approx.:

 -40 -> -10

 -50 -> -30

 -70 -> -35

 -55 -> -20

 -80 -> -30

Flashing point [°C]
approx.:

 < 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.

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