How do extreme pressure additives work?
Afton’s extreme pressure additives and anti-wear additives help protect metal surfaces exposed to a variety of load conditions. Extreme pressure additives react with metal surfaces during operation at high pressures and temperatures, creating a protective layer that that reduces wear between two mating metal surfaces.
What does EP oil mean?
extreme pressure
The function of an extreme pressure (EP) additive is to prevent this adhesive wear and protect the components when the lubricating oil viscosity can no longer provide the necessary film thickness. How does it work? EP additives are polar molecules.
What is EP additives in Grease?
Extreme pressure (EP) additives are lubricant components that chemically react with the metal surface to be protected, forming a sacrificial coating that prevents two metal surfaces from welding together under the high temperature and high pressure that occur during boundary lubrication; Extreme pressure (EP) additives …
Where is EP oil used?
EP 80W-90 Gear Oil is designed for use in a wide variety of applications, including: manual gearboxes, transaxles, transfer boxes, PTO boxes, reduction hubs/gear, differentials (including hypoid designs), axles, planetary and epicyclic drives, shaft drives, sprocket drives, track drives, track rollers, track idlers.
What is a high pressure lubricant?
Extreme pressure additives, or EP additives, are additives for lubricants with a role to decrease wear of the parts of the gears exposed to very high pressures. They are also added to cutting fluids for machining of metals. The chemical reaction between the additives and the surface is confined to this area.
Where are extreme pressure lubricants used?
EP agents are used in particular in applications that may experience heavy loading or shock, such as turbines, gears, and ball and roller bearings. EP additives are not as necessary in engine oils as they are in many gear oils.
What does EP 90 mean?
Part.nr.: 34545. Classic Gear EP 90 is a medium SAE 90 transmission oil with extreme pressure protection for use in classic transmissions. Premium mineral base oils and carefully selected additives provide Classic Gear EP 90 with the following properties: Outstanding lubrication properties. Good resistance to corrosion.
What is EP gear oil used for?
Extreme pressure (EP) gear oils are used to minimize wear and scuffing in automotive and industrial applications under high load conditions, especially where high peak or shock loads are encountered.
How do EP additives work?
EP additives alleviate the dramatic effect of ‘dry’ friction by preventing destructive metal-to-metal contact in lubrication at high temperature and pressure conditions such as those found in certain gear elements in automotive vehicles and various industrial machines where high pressure can cause a film of lubricant …
Why does gear oil contain sulfur?
Sulfur is used in many EP oils and metal-working fluids as an EP additive. The basic way this works is for the sulfur to react at elevated temperatures, such as those experienced by meshing gears to form a sulfide layer. For example, for steel gears, an iron sulfide layer forms on the gear tooth surface.
What type of oil is suitable for thick film lubrication?
Hydrocarbon oils are considered to be satisfactory lubrication for fluid film lubrication.
What does modtc stand for?
Among these additives, molybdenum dithiocarbamate (MoDTC) is demonstrated as a very efficient additive [ 2] present in many commercially available Fully Formulated (FF) oils. This additive, under certain tribological conditions leads to MoS 2 formation on the surface.
How does modtc reduce friction?
As mentioned in the previous paragraphs, MoDTC functions in reducing friction by means of tribochemistry reactions. Shear, temperature and surface chemistry promote the formation of MoS 2 from MoDTC, a well-known solid lubricant.
Does contact pressure and materials play a role in modtc tribochemistry?
This work demonstrates that materials and contact pressure play a crucial role in MoDTC tribochemistry to form a low friction tribofilm, contributing to global engine friction reduction. 1. Introduction One of the main targets in automobile oil development is to increase fuel efficiency by means of reducing friction losses.