Extreme Pressure & Anti-Wear Additives for lubricants and Metal Working Fluids
Extreme Pressure & Anti-Wear Additive (EP/AW Additive) is an additive designed to prevent wear and welding of metal surfaces under high-pressure & high-temperature conditions. They are widely used in modern lubricant formulations.
Chorus® offers a wide range of EP/AW Additives for engine oils, gear oils, hydraulic oils, compressor oils, metalworking fluids, greases, and other lubricants at competitive prices.
- ZDDP (zinc dialkyldithiophosphates)
- Sulfur-contain additives
- Phosphorus-contain additives
- Chloride-contain additives
- Other EP/AW Additive.
Chorus® also offers MoDDP & MoDTC (Organic Molybdenum Friction Modifier).
FAQ about the EP & Anti-Wear Additives
Q: What are the main differences between Friction Modifiers, Anti-Wear Additives and Extreme Pressure Additives?
A: According to boundary lubrication theory, these lubricant additives work at different load-carrying conditions.
Friction modifiers: mainly used to reduce friction coefficient and improve fuel economy, suitable for low load, low temperature or mild working conditions (e.g., energy-saving lubricants).
Anti-wear Additives: used to reduce metal wear under medium load, (e.g., engine oils, hydraulic oils).
Extreme Pressure Additives: specially designed for high load, high temperature, and extreme boundary lubrication conditions to prevent metal surface welding and severe wear (e.g., gear oils, cutting fluids).
Q: What are the differences in the load capacity of extreme pressure & anti-wear additives?
A: Their functions may overlap. Normally, the extreme pressure additives have high load capacity, while anti-wear additives are good at wear control.
Sulfur series (sulfided olefins) > Phosphorus series (such as phosphate esters) > Chlorine series (such as chlorinated paraffin)
Q: What are the active temperatures of the AW additives & EP additives?
A: Different types of extreme pressure anti-wear agents have different activation temperature ranges:
chlorine series: 180 ~ 420 ℃, phosphorus series: 200 ~ 620 ℃, and sulfur series: 600 ~ 1000 ℃.
Q: May I have an EP/AW sample for evaluation?
A: Yes, samples are available.
Please contact Chours sales engineers for the oil additives you are interested in.
Q: What is a Four Ball Test?
A: The most commonly used EP & AW performance test evaluation method is the Four-Ball Test, which is used to evaluate the oil additive's ability to resist welding and extreme pressure failure under high load.
Q: What are the main anti-wear additives in engine oil?
A: The main anti-wear additives used in engine oils are designed to protect metal surfaces by forming protective films, including:
1. Zinc Dialkyldithiophosphate (ZDDP)
2. Molybdenum Dialkyldithiocarbamate (MoDTC)
3. Organic Phosphates & Phosphites
4. Borate Esters
5. Calcium & Magnesium Sulfonates (Detergents with Anti-Wear).
Normally, they work together in a designed formula.
We're professional antiwear ep additive manufacturers and suppliers in China, specialized in providing high quality products and service. We warmly welcome you to buy customized antiwear ep additive at competitive price from our factory. Contact us for more details.
T306, Sulfurized Olefin, Additive 2540