OKS LogoOKS Spezialschmierstoffe GmbH


Tribology

 
 
Select Keyword
Search
 
Tools:
  • print

Oils

with high-performance additives for reliable lubrication

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.