Duralumin (or duraluminum) is an alloy of aluminium (about 95%), copper (about 4%), and small amounts of magnesium (0.5%–1%) and manganese (less than 1%). It is considerably stronger than elemental aluminium, and more resistant to corrosion. This alloy also adds considerable tensile strength to normal aluminium, which otherwise "rips" quite easily.
With this new rip-resistant mixture, duralumin quickly spread throughout the aircraft industry in the early 1930s, where it was well suited to the new monocoque construction techniques that were being introduced at the same time. Duralumin also is popular for use in precision tools such as levels because of its light weight and strength. Today almost all material that claims to be aluminium is actually duralumin.
Duraluminum plate 30 is formed in fan-shaped substantially the same as the organic facings 18a, 18b.
The duraluminum plates 30 are fixed on the back surface or the organic facings 18a, 18b, respectively, so that the centrifugal force, in high revolution, transmits to the driven plate 10 from the duraluminum plate 30.
The duraluminum plate 30 protect the organic facings 18a, 18b from damage by the projected edge line 14 and the recessed edge line 16, because the back surface of the both organic facings 18a, 18b are covered by the duraluminum plate 30.
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