Pure tungsten is widely used in experimental. Experimental tungsten must be a very pure vapor-grown piece of tungsten. Experimental tungsten was grown for research on an internal mandrel through an unknown process, though almost certainly from tungsten hexafluoride either by hydrogen reduction or thermal decomposition.
Experimental tungsten is long and hollow, closed on one side; whether tungsten crucibles could be manufactured economically that way, it is not sure. The outer surface has clearly been lathed; only the bottom retains its porous, almost soft surface characteristic of thick-film deposited metal.
Experimental tungsten of tungsten crucible is a special type of incandescent lamp that uses a gas to chemically return evaporated tungsten to the filament. These lamps are more energy efficient and longer lasting than ordinary tungsten incandescent lamps. They are also more expensive, although rising electricity costs and recent legislation have resulted in tungsten halogen displacing many regular lamps in the market
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