Magnesium Hydroxide
MgOH2, Magnesium Dihydroxide, Milk of Magnesia
- CAS
- 1309-42-8
- EC
- 215-170-3
- Sectors
- Water & Wastewater Treatment, Pharma & Healthcare, Plastics & Polymers
Magnesium Hydroxide (CAS 1309-42-8) is a white, odorless inorganic compound supplied as a powder that neutralizes acids and breaks down at high temperature into magnesium oxide and water; it is used as an antacid and laxative, in wastewater treatment for pH adjustment and heavy metal precipitation, and in flame-retardant plastics.
Typical Properties
| Molecular formula | H2MgO2 |
|---|---|
| Molecular weight | 58.32 g/mol |
| Appearance | odourless white powder |
| Form | powder |
| Color | White |
| Odor | Odorless |
| Melting point | 350 °C (decomp) |
| Density | 2.36 g/cm³ |
| Water solubility | 0.9 mg/100 mL (18 °C) |
| pH | 10.4(1 mM solution);10.4(10 mM solution);10.4(100 mM solution) |
| HS code | 28161000 |
| Grades available | Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Magnesium Hydroxide
Applications
Used in pharmaceuticals as an antacid and laxative, in environmental control as a flue gas desulfurization agent, and in flame-retardant formulations for plastics. It also serves in wastewater treatment for pH adjustment and heavy metal precipitation.
Safety & Risks
Non-toxic and stable; prolonged inhalation of dust may cause mild irritation. Avoid moisture exposure to prevent caking.
Packaging
Supplied in 25 kg paper bags or 1,000 kg bulk sacks. Store in a dry, cool, and sealed environment.