Oil diffusion pumps remain in popular use in the vacuum heat treating industry, possibly one of the few applications remaining for this type of high vacuum pump in the western world.
The main reasons for their continued use are their longevity the lack of other options
many oil diffusion pumps are still used for industrial and some scientific applications in the eastern parts of the world where the cost of a turbomolecular pump is still very high based on the local costs of doing business.
v Vacuum coating : Multi-arc ion coating machine, Magnetron sputtering coating machine, Resistance evaporation coating machine, Electron beam evaporation optical coating machine, Rolling vacuum coating, Continuous vacuum coating machine production line /In-line coating production line, etc
v Vacuum furnace: vacuum soldering/brazing furnace, vacuum annealing furnace, vacuum tempering furnace, vacuum sintering furnace, vacuum carburizing furnace, etc
v Other: electron, chemical industry, metallurgy, aviation, aerospace, material, creature medicine, atomic energy and universe probe, etc.