Membrane dryers use the process of selective permeation of the gas components in the air.The dryer is a cylinder which houses thousands of tiny hollow polymer fibers with an inner coating. These fibers have selective permeation for the removal of water vapor.Unlike traditional drying procedures for dentistry, the pressure dew point at 40°c is a constant ≤ 5°c. There is no risk of condensed water building up in the tank & pressure lines.