Most lubricant applications involve agitation, which traps air in the lubricant and encourages the formation of foam. When foaming becomes excessive, lubricating qualities are less effective, and the result is oxidation and possible cavitation over time.

The lubricant viscosity and surface tension determine the foam stability. Low viscosity oils produce foams with large bubbles that tend to break quickly. High viscosity oils, on the other hand, generate stable foams containing fine bubbles that are difficult to break. Surface active materials, such as dispersants and detergents, further increase foaming tendency.

To combat this problem, Afton’s foam inhibitors alter the surface tension of the oil and help to weaken the structure of air bubbles.  The result is better lubricating qualities and reduced maintenance.