Titanium is an appropriate material for construction due to its corrosion resistance. It is resistant to acids and alkalis, industrial and marine environments. Titanium has a density of 4510 kg/m3, intermediate between aluminium (2700 kg/m3) and steel (7900 kg/m3), giving it the advantage of a good strength to weight ratio. It is less ductile than steel so hot forming is required for severe bending. The metal has a modulus of elasticity half that of steel. Titanium has a low coefficient of expansion (8.9 X 10~6), half that of stainless steel and copper and one-third that for aluminium. This reduces the risk of thermal stress, and enables titanium sheet roofing to be laid in longer lengths than other metals. The use of relatively thin roofing and cladding panels (0.3-0.4 mm) minimises both the dead load and the supporting structural system. Titanium with its very high melting point of 1670°C can withstand fire tests at 1100°C and has been certified as a 'non-combustible material' in Japan for roofing and cladding. Further applications include fascias, panelling, protective cladding for piers and columns and three-dimensional artwork.
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