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INTERNATIONAL TUNGSTEN INDUSTRY ASSOCIATION

Information on tungsten: sources, properties and uses

Smart Windows

Vapour deposited tungsten oxide layers are functional in self-darkening window panes. Tungsten trioxide is yellow-white and fully transparent in the form of a thin layer.  Light converts WO3 to dark blue W20O58 in a reversible reaction, so the light transmission through the pane is reduced in bright sunshine, and the light transmission returns with clouds or at sunset.

 

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