Aluminum hydroxide CAS#21645-51-2
Amphoteric Chemical Reactivity: Exhibits both acidic and basic properties, allowing it to react with acids and alkalis for versatile chemical applications.
High-Purity Solid Form: White, stable solid with consistent composition, suitable for controlled industrial and laboratory use.
Precursor to Aluminum Oxide: Can be thermally converted into aluminum oxide, making it valuable for alumina production processes.
Good Chemical Stability and Safety: Insoluble in water and stable under normal conditions, enabling safe handling and storage.
Product Description of Aluminum Hydroxide (CAS No. 21645-51-2)
Aluminum hydroxide, with the chemical formula Al(OH)₃, is a white solid that is insoluble in water but soluble in both acids and alkalis, exhibiting typical amphoteric behavior. When heated and dehydrated in air, it can be converted into aluminum oxide, making it an important precursor for alumina production. It reacts with acids to form salts and water, and with strong bases to produce corresponding salts and water, further demonstrating its amphoteric nature. Due to its slight acidity, it is also sometimes referred to as aluminic acid (H₃AlO₃).
Parameters
| Melting point | 300℃ |
| Boiling point | 2980℃[at 101 325 Pa] |
| bulk density | ~90g/100 mL |
| density | 2.42 g/cm3 at 20 °C |
| vapor pressure | <0.1 hPa (20 °C) |
| refractive index | Average refractive index: 1.57-1.59 |
| storage temp. | Store at +5°C to +30°C. |
| solubility | 0.0015g/l |
| form | colloidal suspension |
| Specific Gravity | 2.42 |
| color | White |
| PH | 8-9 (100g/l, H2O, 20℃)(slurry) |
| Odor | Odorless |
| PH Range | >7 |
| Water Solubility | insoluble |
| Crystal Structure | Monoclinic |
| Merck | 14342 |
| Solubility Product Constant (Ksp) | pKsp: 32.89 |
| Exposure limits | ACGIH: TWA 1 mg/m3 |
| Dielectric constant | 2.2（Ambient） |
| Stability: | Stable. Incompatible with strong bases. |
| LogP | -1.380 (est) |
| CAS DataBase Reference | 21645-51-2(CAS DataBase Reference) |
| EPA Substance Registry System | Aluminum hydroxide (21645-51-2) |
Safety Information
| Hazard Codes | Xi |
| Risk Statements | 36 |
| Safety Statements | 26-36 |
| WGK Germany | - |
| RTECS | BD0940000 |
| TSCA | Yes |
| HS Code | 28183000 |
| Hazardous Substances Data | 21645-51-2(Hazardous Substances Data) |
| Toxicity | TDLo oral in child: 79gm/kg/2Y-I |
