It is a "slow" reaction and does not self-ignite. $\endgroup$ – J. Ari May 12 '17 at 1:22 Also, magnesium hydroxide adsorbs more energy during the decomposition process. Magnesium hydroxide has a 100oC higher decomposition temperature than ATH, allowing a higher processing temperature in compounding and extruding the plastic. Sharp cutting tools can reduce the fire hazard of machining magnesium. The ignition temperature of magnesium was determined in O2-SO2, O2-N2 mixtures and in O2 from 0.166 to 10 atm pressure. It does however not catch fire as such. With a flame temperature exceeding 5,000 degrees Fahrenheit, magnesium burns hot enough to break down water into its basic components – hydrogen and oxygen. Just as a note, magnesium auto ignition temperature is 746K (from Wikipedia) so you have an increased safety concern not only when you are melting but during any time the molten metal is above this temperature. 3. Magnesium does react with water at room temperature. Burning magnesium is usually quenched by using a Class D dry chemical fire extinguisher, or by covering the fire with sand to remove its air source. The physical and chemical properties of magnesium hydroxide and ATH are shown in Table One. The ignition temperature of magnesium is generally lowered by … A simple reproducible method was developed for determining the ignition temperatures of magnesium and magnesium alloys and by this method magnesium and over 100 magnesium alloys were measured. Maintain proper tool condition. The high-activity silica formed by high-temperature oxidation of magnesium castable with silicon carbide and fused magnesia formed a stable magnesium olivine bonding phase, and the complex phase structure of magnesia/magnesium olivine improved the normal-temperature compressive strength of magnesium castable after burning. Although magnesium can be machined at fast speeds without compromising the quality of the part, it is best to avoid tight clearance angles, because contact between the tool and workpiece increases friction and cutting temperature. Burning magnesium reacts violently to water, producing great heat and a piercing white light. Hence, carbon dioxide fire extinguishers cannot be used for extinguishing magnesium fires either.

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