Aluminum hydroxideCAS：21645-51-2
Excellent flame retardant performance:
It features outstanding fire inhibition capability with an endothermic decomposition heat of 1.17 kJ/g. It can significantly slow down flame spread and reduce smoke emission, fully meeting the requirements of UL 94 V-0 certification criteria.
Ultra-high purity & wide applicability:
The product boasts adjustable particle morphology with a particle size range of 1–80 μm and a purity of over 99.8%. It is widely applicable to ceramic production, catalytic reaction systems and pharmaceutical preparation industries.
Superior environmental remediation capability:
It has a fluoride adsorption removal capacity of 15 mg/g and can neutralize acid mine drainage efficiently, serving as an ideal material for water treatment and purification.
Medical-grade biocompatibility & safety: As a non-toxic raw material, it can be used as an antacid and vaccine adjuvant by activating the NLRP3 inflammasome, with excellent biological safety and compatibility.
Regulable thermal transformation property:
It can be used as a raw precursor to prepare high-performance gamma alumina (γ-Al₂O₃), which is widely adopted in industrial catalytic reaction processes.
Aluminum hydroxide, with the chemical formula Al(OH)₃, appears as a white crystalline powder. It is insoluble in water but readily dissolves in both acidic and alkaline solutions, a key trait that reflects its nature as an amphoteric hydroxide. When subjected to thermal processing in an air atmosphere, it undergoes dehydration to produce aluminum oxide—this property underscores its important role in industrial alumina manufacturing.
As a classic amphoteric compound, aluminum hydroxide reacts with acids to form the corresponding salts and water. It also interacts with strong bases, yielding soluble aluminate substances. Due to its weak acidity, it is sometimes referred to as aluminic acid (H₃AlO₃). In practical reactions with bases, however, it mainly generates tetrahydroxyaluminate anions ([Al(OH)₄]⁻). For this reason, its more precise chemical designation in technical and academic contexts is aluminum hydroxide monohydrate (HAlO₂·H₂O).
Advanced Technical Parameters
Property | Technical Specification |
BET Surface Area | 3-40 m²/g (adjustable via precipitation) |
Oil Absorption | 45-65 mL/100g |
Dielectric Constant | 6.5-7.2 (1 MHz) |
Decomposition Temp | 180°C (onset), 300°C (complete) |
Particle Morphology | Hexagonal platelets (1-80 μm), spherical nanoforms |
Industrial Applications & Innovative Value
High-Performance Flame Retardant Use
Working Mechanism
It decomposes endothermically with a heat absorption value of 1.17 kJ/g and releases water vapor during decomposition, cutting smoke output by more than 60%.
Application Formula
When added into EVA cable materials at a proportion of 60–65%, the finished composite materials can fully meet UL 94 V-0 flame retardant grade requirements.
Pharmaceutical Industry Application
Gastric Antacid Agent
Vaccine Immunologic Adjuvant
Ceramic Materials & Catalytic Field
Catalyst Support Material
High-purity products with purity above 99.8% are widely adopted as carriers for hydrodesulfurization catalysts.
High-End Ceramic Raw Material
It can be used as a synthetic precursor for transparent alumina ceramics; the finished product achieves an in-line light transmittance of over 80% at 640 nm wavelength.
Environmental Governance Application
Fluoride Adsorption Treatment
Under the pH condition of 5.5, its saturated adsorption capacity for fluoride ions can reach 15 mg/g.
Acid Mine Wastewater Treatment
It is capable of neutralizing sulfuric acid in mine drainage and solidifying heavy metal pollutants via precipitation reaction.
Packaging, Storage & Transportation
Packaging Standards
Shelf Life & Storage Conditions
Stored at ambient temperature below 30 °C and relative humidity below 50%, the product can remain stable in quality for up to 24 months. It should be kept away from contact with carbon dioxide in the air.
Operation Safety & Transportation Regulation
The product is categorized as IMDG Code Class 9 miscellaneous dangerous goods with no special transport restrictions. Its dust explosion hazard is rated St-1 (Kst ＜ 200 bar·m/s), complying with IMO SP 340 specifications for combustible dust shipment.
Aluminum hydroxide (Al(OH)₃) is a multifunctional inorganic compound, naturally presented as white crystal powder with Mohs hardness between 2.5 and 3.5. It is barely soluble in water, with solubility lower than 0.1 mg/mL at 20 °C, yet it reacts readily with acid and alkali solutions, showing typical amphoteric chemical properties. When heated above 200 °C, it gradually loses crystal water through thermal decomposition and transforms into gamma-alumina (γ-Al₂O₃), making it a core raw material for related industrial production.
