A family's day with Tungsten
In the ball pen Tungsten is ever present in the most important part -
the ball of the pen. This ball is made from Cemented Carbide.
ballpoint pens are made in the magnitude of several tens of billions
Such balls have a diameter of less than half a millimetre up to more
than one millimetre. In Asia people like to write with finer lines, while in America they
frequently use the big balls. Such a ball is a high precision part, with
exactly the right surface roughness, to carry enough ink and to roll on the
paper without sliding. It also has to be corrosion resistant to withstand the
contact with the ink.
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