The DN factor or rotating speed factor is a guide value up to which rotating speeds lubricants can be used in roller bearings.
FZG torque change test device
With the FZG torque change test device, oils and greases are examined in particular with regard to their suitability as lubricants in closed gears. The wear is determined after every load level and the so-called “damage load level” specified as the result. The test method is described in DIN 51 354.
The Lubrimeter test is a test device with which the coefficient of friction, wear and operating temperature of lubricants is measured for a specific period at changing loads and sliding speeds with different materials.
The oil separation is measured to DIN 51 817 as a % by weight. In the process, pressure and temperature is applied to the lubricating grease to be tested.
Chemical changes to material through the influence of heat, light and oxygen across the operating time.
Deutscher Verein des Gas - und Wasserfaches (German Technical and Scientific Association for Gas and Water).
Lubricants with Extreme Pressure additives in order increase the pressure resistance and the wear protection properties.
International Standardization Organisation.
Reaction of a metal with its environment which results in a change and impairment of the function of a component.
Approval for plastics in the drinking water sector.
Landesgewerbeanstalt Nürnberg with its institute for food chemistry.
Liquids that dissolve other materials without chemical changes.
Is achieved through solid lubricants when grease or oil lubricants provide insufficient lubrication.
Resistance to oxidation
Resistance to oxidation is a measure to calculate the resistance against reactions with pure oxygen. According to DIN 51 808, the grease is subjected to increased pressure together with oxygen for a specific period (e.g. 100 hours) and temperature (e.g. +99 °C or +160 °C). The test result is the drop in pressure of the oxygen in Pa (Pascal) as a measure for the degree of oxidation.
Layer thickness (corrosion protection)
The layer thickness has a decisive influence on the duration of the corrosion protection. To this purpose various measuring methods are used which specify the layer thickness in μm, depending on the type of protective layer.
The evaporation loss is of interest particularly for high-temperature lubricants. According to DIN 58 397 it is examined at high temperatures for a specified period. The loss of evaporated oil as a % by weight should be as low as possible.
Corrosion that occurs at fits that are subjected to vibrations with micro frictional movements. Immediate rust formation at abrasive particles of steel.
Occurs with slow movements and insufficient separating effect of the lubricant, since the initial friction is higher than the movement friction.
Are produced through synthetic processes. They have particularly good viscosity temperature characteristics, are resistant at low and high temperatures and against ageing. Excellent separating properties. Outstanding lubricant for plastics and elastomers. Designations such as polydimethylsiloxane or polyphenylmethylsiloxane specify the special structure of the molecule groups.
Produced through chemical processes in contrast to oils from Nature – mineral oils, vegetable oils and animal oils. Allowing certain advantages to be achieved, such as low tendency to coking, low pour point, good resistance to chemicals and often excellent viscosity temperature characteristics. Synthetic hydrocarbons, ester, polyglycols, fluorinated oils and silicone oils are used e.g. for lubricants.
Volatile Corrosion Inhibitor is an environmentally friendly corrosion protection additive.
Arises when the lubricating film is breached, so that the sliding partners come into contact and rub against each other.
Paraffinic mineral oil, highly refined, to remove unstable components. White oils are used, for example, in lubricants for medical applications.