EP/AW Additives

EP/AW Additives-PSAIL ® Series
UNPChemicals is a professional lubricant additives manufacturer in China, providing a full portfolio of high-performance EP/AW additives covering both Phosphorus-based and Sulfur-based series under our PSAIL® brand. Our products serve as cost-effective, drop-in alternatives to equivalent grades from BASF, LANXESS, Vanderbilt and Arkema.
Phosphorus-based EP/AW Additives
Phosphorus-based extreme pressure anti-wear additives are one of the most widely used high-performance lubricant additive families for moderate to heavy load lubrication systems. Under boundary lubrication and frictional heating conditions, they undergo tribochemical reactions with metal surfaces to form a dense phosphate protective film, delivering excellent anti-wear performance and preventing surface sintering under heavy loads.
UNPChemicals manufactures a full range of phosphorus-based EP/AW additives under our PSAIL® brand, providing flexible solutions for lubricant formulators. Our core product lines include phosphite series, phosphate ester series, amine-neutralized phosphate & thiophosphate series, covering applications from hydraulic oils, industrial gear oils to metalworking fluids.
Sulfur-based EP/AW Additives
Sulfur-based extreme pressure anti-wear additives are the most effective additive category for extreme operating conditions involving heavy loads, high temperatures and impact stresses. Under boundary lubrication, they form a high-melting-point iron sulfide film with low shear strength via tribochemical reactions, which prevents micro-welding and adhesion between contacting metal surfaces.
With outstanding extreme pressure performance and reliable sintering resistance, these additives are the core formulation component for heavy-duty industrial oils, greases and metalworking cutting fluids. UNP Chemicals offers a complete portfolio of PSAIL® sulfur-based EP/AW additives, including alkyl polysulfides, sulfurized olefins, sulfurized fatty acid esters and multifunctional thiocarbamate additives, to meet diverse heavy-load formulation requirements.

Top UNPchemicals EP/AW additives

What are EP/AW additives?

Extreme Pressure (EP) and Anti-Wear (AW) additives are specific types of lubricant additives used to reduce wear, prevent metal-to-metal contact, and enhance the performance of lubricants operating under high pressure and load conditions. EP additives protect metal surfaces under extreme pressure conditions, whereas AW additives provide wear protection under more moderate conditions. These additives are essential components in various industrial and automotive lubricants, such as gear oils, hydraulic fluids, and engine oils.

Features of EP/AW additives

Wear protection: EP/AW additives form a protective film on metal surfaces, reducing friction and preventing wear during operation.

Extreme pressure resistance: EP additives are specially designed to handle extreme pressure conditions that can lead to metal surface damage, scuffing, and seizures.

Load-carrying capacity: The presence of EP/AW additives improves the load-carrying capacity of lubricants, enabling components to function optimally even under high load conditions.

Extended equipment life: EP/AW additives increase the durability and lifespan of mechanical components by providing better wear protection and reducing component damage due to metal-to-metal contact.

Types of EP/AW additives

There are several types of EP/AW additives, each with distinct chemistries and mechanisms of action:

Sulfur-containing additives: Include sulfurized fatty acids, sulfurized esters, and sulfur-phosphorus compounds. These additives react with metal surfaces under heat and pressure, forming a protective layer that provides wear protection and reduces friction.

Phosphorus-containing additives: Commonly used phosphorus additives include zinc dialkyldithiophosphates (ZDDP) and tricresyl phosphate (TCP). They form a protective phosphorus film on metal surfaces, providing excellent anti-wear and extreme pressure protection.

Boron-containing additives: Boron additives like borate esters can provide both extreme pressure and anti-wear protection by forming a low shear strength chemical film on metal surfaces.

Applications of EP/AW Additives

Extreme Pressure (EP) and Anti-Wear (AW) additives play a critical role in enhancing the performance and extending the life of lubricants in various applications by reducing wear and preventing metal-to-metal contact, especially under high pressure and load conditions. Some common applications of EP/AW additives include:

Engine oils: EP/AW additives can be found in engine oils used in automotive, marine, and industrial applications. They help protect engine components from wear, extend engine life, and maintain optimum performance under high loads and pressures.

Gear oils: Gears operate under high pressure and load conditions where metal-to-metal contact can cause wear and damage. EP/AW additives are essential components in gear oils used in automotive and industrial gearboxes, ensuring that gears function smoothly and reduce wear, pitting, and seizure.

Hydraulic fluids: Hydraulic systems, commonly found in construction, mining, and industrial equipment, require hydraulic fluids with EP/AW additives to protect components such as pumps, cylinders, and valves from wear and damage under high pressure and load conditions.

Greases: In automotive and industrial applications, greases with EP/AW additives are used to provide lubrication for components such as bearings, slides, and joints that experience high pressure and load conditions, significantly improving wear protection and extending component life.

Compressor oils: Compressor oils can also benefit from EP/AW additives, especially those used in screw-type and reciprocating compressors, as they minimize wear and reduce friction in high-pressure environments.

Turbine oils: In turbines, particularly steam turbines, EP/AW additives help protect components like bearings and gearboxes from wear and damage, ensuring smooth and reliable operation.

Metalworking fluids: Metalworking fluids that are used in processes such as cutting, grinding, and shaping require EP/AW additives to minimize tool wear and protect workpiece surfaces from damage during high-pressure and high-load operations.

These applications highlight the importance and versatility of EP/AW additives in various industries, where they contribute to improved performance, reduced wear, and extended component life under challenging conditions.

Price of EP/AW additives

The price of EP/AW additives can be influenced by various factors:

Type: The specific type and chemistry of the EP/AW additive can impact its cost.

Quality: The purity, effectiveness, and formulation of the additive can influence its price.

Quantity: The purchase volume of the additive, such as for bulk purchases, may result in cost variations.

Manufacturer: Prices may differ depending on the manufacturer, their expertise, quality standards, and reputation in the market.

How to select EP/AW additives?

When selecting EP/AW additives, consider the following factors:

Application: Evaluate the specific application and lubricant type, whether it is for industrial equipment, automotive engines, or gearboxes, to determine the most suitable EP/AW additive.

Operating conditions: Consider the pressure, load, temperature, and other operating conditions to select the most appropriate additives that can withstand the anticipated working conditions.

Compatibility: Ensure the chosen EP/AW additive is compatible with the base oil and other additives in the formulation to avoid any adverse reactions or reduced performance.

Environmental impact and regulations: Opt for EP/AW additives with minimal environmental impact and that comply with relevant regulations and industry standards.

By considering these factors, manufacturers and users can select appropriate EP/AW additives to enhance lubricant performance, reduce wear, and extend the service life of mechanical components, particularly under high pressure and load conditions.

EP/AW Additives Supplier

UNPChemicals is a professional and trusted EP/AW additives supplier manufacturing high quality and range of EP/AW additives according to your workflows and products. If you are looking for high performance EP/AW additives solution, feel free to contact us.

Frequently Asked Question

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