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In page Guggenheim Museum Bilbao:

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Its lamination process is delicate and has to be done in places with high energy sources, that is why the laminated parts were made in Pittsburgh, in the United States, the rolling allowed to obtain titanium plates only 0.4 mm (0.016 in) thick,[1] which is much thinner than if steel plates had been used. Moreover, titanium is about half the weight of steel, and the museum's titanium coating represents only 60 t (59 long tons; 66 short tons).[citation needed]