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Found this brief explanation helpfull and thought I would share:
Often times, we hear of Glucydur being used in the construction of watch movements. So what exactly is Glucydur?
Glucydur is the trade name of a metal alloy with a low coefficient of thermal expansion, used for making balance wheels and other parts of mechanical watches.
Glucydur is a beryllium bronze; an alloy of beryllium, copper and iron. In addition to its low coefficient of thermal expansion, its hardness (400 Brinell), nonmagnetizability, and resistance to deformation and damage make it suited for making precision parts that must have high dimensional stability. Glucydur is also resistant to corrosion; it is rather inert chemically.
Glucydur was developed about the same time with another non-magnetic material, Nivarox.
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Certified watch nut.
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