Aluminum hydroxide CAS:21645-51-2

Outstanding Flame Retardant Performance

It delivers outstanding fire suppression capacity via endothermic breakdown releasing 1.17 kJ/g heat absorption. This property restrains flame spread and smoke release remarkably, fully meeting UL 94 V-0 vertical flammability criteria.

Ultra-High Purity & Wide Application Flexibility

Customizable particle morphology ranging from 1 μm to 80 μm can be tailored on demand. It fits ceramic production, catalytic carrier systems and pharmaceutical compounding, with purity exceeding 99.8%.

Powerful Water Treatment & Eco-Remediation Capacity

The material boasts a fluoride adsorption capacity up to 15 mg/g, and can neutralize acidic mine effluent efficiently, serving as a reliable medium for water purification projects.

Pharma-Grade Biocompatible Material

Non-toxic by nature, it works as an oral acid neutralizer and immunostimulant for vaccines. Its immune enhancement effect comes from triggering NLRP3 inflammasome response, without causing biological incompatibility risks.

Tunable Thermal Transformation for Catalyst Raw Material

It serves as an ideal starting material to fabricate high-performance γ-alumina after controlled calcination, laying a solid foundation for diverse industrial catalytic manufacturing workflows.

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Product Details

Aluminum hydroxide (Al(OH)₃) is a white crystalline powder. As a typical amphoteric hydroxide, it is insoluble in water but soluble in acidic and alkaline solutions. Thermal treatment in air causes dehydration to produce aluminum oxide, making it an important raw material for industrial alumina production. This substance exhibits typical amphoteric reactivity. It reacts with acids to form aluminum salts and water and reacts with strong bases to generate soluble aluminates. Due to its weak acidity, it can also be referred to as aluminic acid (H₃AlO₃). In reactions with alkalis, it mainly produces tetrahydroxyaluminate anions ([Al(OH)₄]⁻). Therefore, aluminum hydroxide monohydrate (HAlO₂·H₂O) is a more chemically accurate expression.

Aluminum hydroxide CAS:21645-51-2

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

Aluminum hydroxide CAS:21645-51-2

Advanced Flame Retardancy

The material achieves superior fire resistance via endothermic decomposition with a heat absorption value of 1.17 kJ/g. The released water vapor can cut smoke output by more than 60%. When applied in EVA cable materials with a filling proportion of 60–65%, the modified composites can reach the UL 94 V-0 flame retardant standard.

Pharmaceutical Engineering

As a mild antacid agent, it neutralizes excessive gastric acid with little carbon dioxide production, stabilizing gastrointestinal pH within the range of 6.5–7.5. It also acts as a common vaccine adjuvant that enhances antigen immune responses by activating the NLRP3 inflammasome signaling pathway.

Ceramic & Catalysis Industry

High-purity aluminum hydroxide (purity > 99.8%) is widely adopted as a support material for hydrodesulfurization catalysts. In advanced ceramic manufacturing, it serves as a key precursor for transparent alumina ceramics, which can achieve an in-line light transmittance of over 80% at 640 nm wavelength.

Environmental Remediation Performance

Under an optimal pH condition of 5.5, the material exhibits a fluoride adsorption capacity of 15 mg/g. It can effectively neutralize sulfuric acid contained in acid mine drainage and immobilize heavy metal contaminants via chemical precipitation, realizing efficient water remediation.

Packaging, Storage & Transportation Specifications

For logistics packaging, standard 25 kg three-layer corrugated cartons and 1000 kg PE-lined flexible bulk bags are adopted, while ISO tank containers are available for liquid-related transportation. The product can remain stable for up to 24 months under storage conditions below 30 °C and relative humidity below 50%, and isolation from atmospheric carbon dioxide is required.

In terms of transportation safety, it belongs to IMDG Class 9 non-restricted goods. Its combustible dust hazard grade is St-1 with a Kst value lower than 200 bar·m/s, fully complying with the IMO SP 340 specifications for combustible dust delivery.

Aluminum hydroxide (Al(OH)₃) is a multifunctional inorganic white crystalline powder with a Mohs hardness of 2.5–3.5. It features extremely low water solubility (less than 0.1 mg/mL at 20 °C) and displays typical amphoteric properties, capable of reacting with both acids and alkalis. When heated above 200 °C, it gradually dehydrates and converts into gamma-alumina (γ-Al₂O₃), making it a core raw material for industrial alumina production.

Aluminum hydroxide CAS:21645-51-2