Bearings are mechanical components that allow moving parts to rotate or move more smoothly by reducing friction. Bearings of all shapes and sizes are widely used in various industries. Most bearings are generally lubricated with grease and can operate in a temperature range of 90 to 100°C.
In some high-temperature environments, however, standard bearings cannot serve their full service life. Components such as rubber seals and polymer cages will show signs of failure at around 120°C. At temperatures above 150°C, standard bearings require frequent relubrication due to reduced grease life.
Very high temperatures can also cause structural changes in bearings. Bearing clearance is reduced and eventually the bearing may seize. Bearing failures lead to frequent downtime and unscheduled maintenance, which can result in huge costs.
In industrial applications with extremely high temperatures, such as the metallurgical industry and the food and beverage industry, it is necessary to use high temperature bearings instead of standard bearings.
High temperature bearings are best suited for use in operations where the environment is hot and dry, with low rotational speeds.
Food and beverage industry
These specially designed bearings are often lubricated with graphite instead of grease. Graphite is commonly used as a solid lubricant. It can operate at temperatures up to 350°C, making it suitable for use in high temperature environments. These bearings do not need to be relubricated, saving time and costs.
High temperature bearings can reduce total cost of ownership in the following ways:
- Longer bearing life in high temperature applications
- No relubrication
- Less maintenance needs can, in turn, improve productivity and efficiency.
- Food grade variants are available for the food industry
- Greater safety for workers, as manual lubrication in high temperature conditions can be dangerous.
