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An exothermic composition comprises a particulate readily oxidizable metal such as aluminum, magnesium or silicon and an organic fluorine-containing compound, and usually an oxidizing agent for the readily oxidizable metal. The preferred organic fluorine-containing compound is polytetrafluoroethylen

An exothermic composition comprises a particulate readily oxidizable metal such as aluminum, magnesium or silicon and an organic fluorine-containing compound, and usually an oxidizing agent for the readily oxidizable metal. The preferred organic fluorine-containing compound is polytetrafluoroethylene. The composition may also contain a binder, a particulate refractory material, refractory fibres and/or organic fibres. The composition may be used in the casting of molten metal, either in particulate form or as a preformed shape such as a sleeve or board, to cover or surround molten metal in the feeder of a casting mould or in the head or head box of an ingot mould.

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An exothermic composition comprising by weight, 10-30% of a particulate readily oxidizable metal; an oxidizing agent for the metal in an amount of up to 20%; 0.05-10% of an organic fluorine-containing compound selected from the group consisting of polytetrafluoroethylene, polyhexafluoropropylene, po

An exothermic composition comprising by weight, 10-30% of a particulate readily oxidizable metal; an oxidizing agent for the metal in an amount of up to 20%; 0.05-10% of an organic fluorine-containing compound selected from the group consisting of polytetrafluoroethylene, polyhexafluoropropylene, polychlorofluoroethylene and polyvinylfluoride; 5-80% of a particulate refractory material; 1-55% of a refractory fiber; and a binder in an amount of up to 25%.