Midwest Tungsten Service manufactures a wide variety of vacuum evaporation sources including filaments, boats, electron beam and ion beam sources from tungsten, molybdenum and tantalum. MTS also supplies tungsten, molybdenum and tantalum raw material and custom machines parts from these metals. MTS offers its own brand of silicone diffusion pump fluid and TIG welding electrodes. We carry an extensive inventory to assure prompt delivery.