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The vacuum pump vanes located eccentrically in the rotor grooves reduce the working space and create vacuum or compression.
Vacuum pump vanes are produced in two materials, either carbon or plastic.
Vacuum pump vanes made of carbon are used in dry-running, oil-less, vacuum pumps and compressors with continuous wear, since the vane itself is the lubricant. Therefore no liquid lubricant or oil is required.
The other type of vanes are made of plastic and are used with oil lubrication. The plastic vacuum pump vanes can withstand thermal and mechanical load, and its thermal dimensional change is almost irrelevant. Nevertheless, these vanes wear out over time and they need to be replaced at regular maintenance. Two types of fabric material were developed for plastic vanes: Fibreglass and Kevlar (plastic vane and Kevlar vane also called blades). Kevlar vanes can be usually found in Busch vacuum pumps and they ensure better vacuum and longer life.