The aluminium melt is extremely easy oxidation and inhale when it is in melting. A cover flux for aluminium is required to have low melting, low density, good humidity, and can form a dense uniform protective film, which we called it cover flux.
Application of Cover Flux (SATA-PF-340)
Use Instruction: it can added at one time before refining or it can added in two batches,first add half covering flux to the molten aluminium and stir the melt and make the flux fully react to molten, then skimming the dross and spread the balance on the surface of the aluminium molten.