How is tungsten used in philately (the study of postage stamps)?

For this reason, it is commonly used in light bulbs. Also, because of its notable hardness, tungsten carbide alloy tool bits are primarily used in machine ... Tungsten became a strategic metal during World War II as its resistance to high temperatures and its strengthening of alloys made it an important raw material ... A tungsten electrode containing 1.3-1.5 wt-% of dispersed lanthanum oxide (La2O3) for enhanced arc starting and stability, reduced tip erosion rate. Jun 9, 2014 ... In smaller aircraft, lead or tungsten weights are used in the ailerons and the elevators, which are what steer the aircraft and control its ... Our tungsten chemicals can be used in a variety of ways. First and foremost, however, they serve as precursors for various catalysts such as DeNOx catalysts ... The tungsten filament is used most often with incandescent lamps because it has a high melting point (around 3419°C) and a low rate of evaporation. Jan 20, 2012 ... I tried out the .040" on some razor blades with decent results, but could do just as well with a 1/16 sharpened to a long taper. Feb 22, 2014 ... Tungsten has a very high resistance to temperature, making it ideal for certain types of materials from television tubes to microwaves. In ... Oct 22, 2016 ... Tungsten is used on aircraft, for counterweights, in replacement of uranium that was a bit more touchy to recycle. See a list here (while trying ... Tungsten carbide bits are a type of cutting tool used in a variety of industries for drilling, cutting, and shaping hard materials such as metal, wood, and ...