Model No.	Chemical Composition (%)
	Mg	Fe	Si	Al	Mn	Cu	Ni
	≥	≤
Mg 9990	99.90	0.04	0.03	0.02	0.03	0.004	0.001
Mg 9995	99.95	0.005	0.015	0.01	0.01	0.002	0.001

Magnesium ingot 99.9 refers to magnesium ingots with a purity of 99.9%. It have other name such as Magnesium 99.9 and Mg 9990. It is a light alkaline earth metal with a density of 1.74g/cm3. Mg has active chemical properties and can react with acids to generate hydrogen and react with alkali to generate hydrogen and magnesium hydroxide.

Magnesium metal is useful in many fields, such as chemical, electronics, military, aerospace and other industries. Magnesium 99.9 and Magnesium 99.95 are the most consumed models of Mg metal ingot.

The implementation standard of Magnesium 99.9 is GB/T 3499-2011. This kind of Magnesium ingot is mostly useful in magnesium alloy production, aluminum alloy production. Moreover, it is very important in steelmaking desulfurization, aviation and military industry and other fields.

In addition, the applicable fields of Magnesium 99.9 also include automobile manufacturing, light industry, metallurgical industry. In addition, in chemical industry, electronic industry and instrument manufacturing industry.

To get Magnesium 99.9, you need to pay attention to some issues in production. The mass fraction of oxygen in the magnesium ingot needs to keep within a certain range. For example, the mass fraction of oxygen in the magnesium ingot should be below 0.010%, and the target value is below 0.006%. Other elements such as Fe, Si, Al, etc. must also be controlled within a lower range.

Magnesium 99.9 Mg 9990 is very pure and easily forms loose and lightweight magnesium oxide in humid air. At the same time, when the quality of the paint is not high, after humid air enters the gap, it will directly react with the magnesium alloy and easily generate magnesium hydroxide. Therefore, if it is not used for a long time, Magnesium 99.9 should be acid washed to prevent it from oxidizing.