Fluxes are special blends of typically solid, inorganic compounds designed for degassing, demagging, cleaning, grain refining, and chemistry modification of molten aluminium alloys and other purposes. Fluxes are usually added during the melting, holding or degassing of aluminium to furnaces, crucibles, ladles, or other aluminium vessels. Flux raw-material quality, addition method and product form can all affect efficiency. A flux recipe varies depending on its purpose and other process variables, such as alloy and temperature.