Glucidur (glucydur)

A highly elastic, hard, non-magnetic and non-oxidising alloy used to make monometallic balances, assortments (escapements) and balance-springs.

A Glucydur balance is made from a copper alloy containing 3% beryllium and around 0.5% nickel. It is recognisable by its gold colour. 

Glucydur is a multi-metallic alloy, used in the watch industry for building different parts of the mechanism.

Glucydur is an alloy of beryllium, copper and iron. Due to such properties as hardness, resistance to deformation, damage or magnetic fields and its stability this alloy is perfect for making balance wheels for watches' mechanisms. Glucydur is also resistant to corrosion; it is rather inert chemically. Due to these qualities it is extensively used in producing antimagnetic watches.

Glucydur was developed about the same time with another non-magnetic material - Nivarox.