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The resistance generated by the seal (if present), depending on the surface finish of the outside diameter of the inner ring, as well as of the rotational speed. The resistance generated by the cage, depending on the geometrical form and the machining quality of the cages. The resistance generated by the lubricant, depending on the lubricant viscosity and filling quantity as well as the rotational speed. At low speed and with fine instrument oil this resistance is insignificant. It will be higher at low temperatures and at high viscosity of the lubricant. Grease lubricated bearings will show, according to the grease type and filling, a much higher friction torque than oil lubricated bearings.

Glass distillation columns up to DN 600 are packed with random packing such as Raschig rings, ceramic saddles, PFA packing elements or structured packing dependent on the required separation performance and process media. Each packing type shows different separation performance, indicated by their number of theoretical stages. In combination with glass process equipment, highly corrosion resistant packing material is used for packed glass distillation columns.