What is a limitation of semi-solid lubricants (grease) during lubrication?

Semi-solid lubricants, such as grease, have specific properties that limit their effectiveness in certain applications. One key limitation is their ability to remove heat from bearing surfaces. Grease is designed to adhere to surfaces rather than flow freely, which can hinder its ability to dissipate heat generated by friction.

In most applications, liquid lubricants are favored for their superior ability to absorb and transport heat away from bearing components. This flow capability allows them to efficiently carry heat away to cooler areas, helping to maintain optimal operating temperatures. In contrast, the thicker, more adhesive nature of grease can trap heat in the bearing area, leading to potential overheating.

Consequently, while grease serves various important functions, such as providing effective sealing and reducing wear, its heat removal capacity is a significant limitation that should be considered when making lubrication choices in machinery and equipment.