Patent ID: 7988762

Claim:
A method for preventing combustion of a molten magnesium/magnesium alloy in a magnesium or magnesium alloy production, comprising allowing a gas composition comprising: a protective gas that is a compound selected from the group consisting of 1,1,1,3,3-pentafluoropropane (HFC-245fa), 1,3,3,3-tetrafluoropropene (OHFC-1234ze), methyl 1,1,2,2-tetrafluoroethyl ether (HFE-254 pc), and mixtures thereof; and a carrier gas, to flow onto a surface of the molten magnesium/magnesium alloy molten at 600-850° C., wherein the gas composition is allowed to flow at a flow velocity that is sufficient for producing ignition proof effect, in a range of 5-5000 mL/min/m 2 in protective gas flow rate per molten metal unit area.