Supplier and fabricator of tungsten, molybdenum and tantalum. Manufacturer of a complete line of evaporation sources and materials for vacuum deposition of thin films.Midwest Tungsten Service Midwest Tungsten Service sells tungsten, tungsten alloy, molybdenum, and tantalum in rod, wire, sheet, plate, and bar form. We custom machine parts of tungsten, molybdenum, tantalum, and their alloys. Midwest Tungsten Service manufactures resistance heated evaporation sources and materials for vacuum evaporation (vacuum metallizing). These sources include tungsten filaments and boats, molybdenum filament