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An off-white, low fluoride exothermic drossing flux for treating aluminium alloys.
Coverall 77 is used for drossing off crucible and reverberatory furnaces where the aluminium alloy is held at a wide range of temperatures (710øC - 780øC).
Coverall 77 is a low fluoride product, producing exceptionally low levels of fume in operation.
Sprinkle a small quantity of the flux (0.25% - 0.5% by weight of metal charged) onto the surface of the melt and rabble in thoroughly for 1 - 2 minutes, until the dross is glowing. Then, either remove the dry powdery dross or push it to the back of the crucible before casting.