MOSIL Lubricants

Understanding Grease Bleeding

July 16, 2025

Essential Insights for Industrial Lubricants and Specialty Greases

In the world of industrial lubricants, the performance and reliability of equipment often hinge on the quality and behavior of the greases used. Specialty lubricants and high-performance lubricants are engineered to meet the demanding needs of industries such as automotive, food processing, mining, marine, textile, and metalworking. One property that both lubricant manufacturers and industrial grease suppliers must consider is grease bleeding-the process by which oil separates from thickened greases.

This blog explores the science behind grease bleeding, its impact on machinery, and best practices for storage, handling, and application. Whether you’re sourcing from lubricant suppliers in India/Mumbai, buying industrial lubricants online, or seeking custom lubricant solutions, understanding grease bleeding is crucial for optimal equipment performance.

What Is Grease Bleeding?

Grease bleeding refers to the release of oil from the thickener matrix of a grease, either during storage or under operational load. This property is essential for proper lubrication, especially in load zones such as the rolling elements of bearings. When subjected to heavy loads, the grease releases oil, which then forms a lubricating film to protect the component. In some cases, additives and even the thickener itself contribute to the lubrication process.

∙ In Storage: Oil separation is observed as small pools of oil on the grease surface, particularly if the surface is uneven or a scoop has been removed.

∙ In Operation: Oil may leak from a lubricated component due to extreme pressure or heavy loading.

Why Does Grease Bleed?

Grease bleeding is a natural characteristic of all specialty greases and cannot be eliminated entirely. Factors influencing oil separation include:

∙ Storage Temperature: Higher temperatures accelerate oil release.

∙ Base Oil Viscosity: Lower viscosity oils tend to separate more readily. ∙ Storage Duration: Longer storage increases the likelihood of oil separation.

Studies indicate that up to 5% oil separation by volume is normal during storage. For synthetic greases, PTFE grease, molybdenum disulphide grease, and silicone lubricants, this behaviour is expected and manageable.

Managing Grease Bleeding: Best Practices

Storage and Handling

∙ Store new grease cartridges upright with the plastic cap facing up to prevent oil leakage.

∙ If using a grease gun, depressurize and store it horizontally in a clean, cool, and dry place to maintain grease consistency throughout the cartridge.

∙ Follow lubricant storage and handling best practices to minimize contamination and preserve lubricant integrity.

Before Use

∙ If oil separation is visible, stir or mix the oil back into the grease using a clean spatula. Blend the oil into the top 2 inches of grease in a contamination-free environment.

∙ Always verify the correct grease before application, referencing lubricant safety data sheets (SDS) and lubricant application guides.

During Operation

∙ If oil leaks from equipment, the remaining grease may harden. In such cases: o Regrease components more frequently

o Purge excess grease

o Avoid over-lubrication

o Consult with your lubricant technical support team for guidance on regreasing intervals and procedures.

o Industry Applications and Product-Specific

Considerations

∙ Lubricants for food processing: Choose NSF-approved lubricants and consult a food-grade lubricants supplier.

∙ Lubricants for the automotive industry, textile machinery, mining equipment, marine applications, and metalworking: Select greases and oils tailored for specific operational demands, such as high-temperature lubricants, low-temperature lubricants, biodegradable lubricants, chain lubricants, gear oils, hydraulic fluids, compressor oils, and anti-seize compounds.

∙ Environmentally friendly lubricants: Opt for products designed to minimize environmental impact, especially in sensitive applications.

Choosing the Right Grease: Expert Support

How to choose the right industrial lubricant?

Partner with experienced lubricant manufacturers, specialty oil manufacturers, and bulk lubricant suppliers who conduct thorough lubricant testing and analysis. They can provide custom lubricant formulation, OEM lubricant solutions, and even private label lubricants to meet your unique requirements.

Conclusion

Grease bleeding is a normal and manageable aspect of using specialty lubricants in industrial applications. By following proper storage, handling, and application protocols, you can ensure that your high-performance lubricants deliver maximum protection and efficiency. For tailored advice and advanced solutions, connect with reputable lubricant distributors and industrial grease suppliers who offer comprehensive technical support and industry expertise.