Magnesium hydroxide
English Name: Magnesium hydroxide
Molecular Formula: Mg(OH)2
Molecular Weight: 58.32
Pharmaceutical Grade Magnesium Hydroxide
English Name: Magnesium hydroxide
Molecular Formula: Mg(OH)2
Molecular Weight: 58.32
Physicochemical Properties: Magnesium hydroxide white crystalline or powder; and its aqueous solution show alkaline reaction; 2.36g/cm3. It is soluble in diluted acid and ammonium salt solution and almost insoluble in water and alcohol. Its solubility (18°C)in water is 0.0009g/100g. It is easy to absorb carbon dioxide in the air. When it is heated to above 200°C in alkaline solution, it will become hexagonal crystal system crystalline. At 350°C, it shall decompose into magnesium oxide and water, and change into magnesium oxide by losing water above 500°C.
Use: Magnesium hydroxide used in medicine trade as magnesium source and purgative, etc.; and as anti-acid agent in toothpaste and cosmetics, also in other fields required to have high-purity magnesium hydroxide.
Processing Method: Brine-lime method, brine-ammonia method
The index refers to the united states pharmacopoeia USP-25
Items | Index | |
Appearance | White powder | |
Identification | complies | |
Pb ppm %≤ | 0.001 | |
heavy metals %≤ | 0.002 | |
Content %≥ | 96-100.5 | |
CaO %≤ | 1.5 | |
loss on ignition %≤ | 30.0-33.0 | |
Carbonate %≤ | complies | |
E. coli %≤ | complies | |
soluble salts and free alkali | acid is consumed | 2.0ml |
residue remains | 10.0mg | |
loss on drying %≤ | 2.0 | |
