This section provides an overview for extreme pressure greases as well as their applications and principles. Also, please take a look at the list of 10 extreme pressure grease manufacturers and their company rankings.
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An extreme pressure grease is a grease that has excellent high-load lubricating, metal surface protection, and friction resistance performance. It also has a sealing performance, such as water resistance and adhesion. It is intended to lubricate and protect parts such as high-rotation bearings, metal sliding parts under high loads and high speeds, and gears under high loads.
Although it is necessary to further reduce viscosity to reduce clay resistance, viscosity is a general value in order to maintain the adhesion and sealing properties originally required for grease. Clay resistance can be freely adjusted by additives.
Extreme pressure greases are used to withstand situations that exceed the normal lubrication capabilities of the base oil. Examples of such situations include gear galling, impacts that exceed the lubrication tolerance of the base oil, and the occurrence of extreme pressure due to the presence of foreign matter such as sand. It is also used for outer ball joints of drive shafts of FF vehicles, which are susceptible to impact, and for construction equipment and heavy machinery that are at high risk of biting gravel.
The lubrication range under normal conditions depends on the performance of the base oil and thickener. However, when extreme pressure occurs, it must be there to intervene.
Extreme pressure is the frictional resistance applied to a point or line of contact. The normal lubricant film becomes thinner as the load increases, and metal-to-metal contact causes increased wear and friction, resulting in seizure. The use of extreme pressure additives makes it possible to avoid this burning and maintain the thickness of the oil film.
Contact surfaces under high loads are always accompanied by high temperatures, and these high temperatures trigger the reaction of extreme pressure additives. Extreme pressure additives are stable at room temperature or relatively low temperatures and become active and react with the metal at slightly lower temperatures before reaching the higher temperatures where fusion occurs. The best additives are those that have a high reaction rate.
Since this action is a kind of corrosion action, extreme pressure additives must react only in the metal contact area. Extreme pressure additives are generally sulfur-, chlorine-, or phosphorus-containing substances, such as sulfide oils and fats, sulfide esters, sulfides, chlorinated hydrocarbons, lead naphthenate, and compounds containing two or more elements from sulfur, phosphorus, and chlorine in the same molecule.
*Including some distributors, etc.
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