Aluminum Hydroxide

Aluminum Hydroxide

CAS Number
21645-51-2
Molecular Formula
AlH3O3
Purity
Aluminum Hydroxide 99.723 Purity
Pharmaceutical segment: IP/BP/USPFR Grade: High-purity (99.9% Al (OH)3)Pharma Grade: DRIED/ GELHuber flame retardant additiveREACH Registered

About Aluminum Hydroxide

We supply commercial and electronic-grade Aluminum Hydroxide (CAS 21645-51-2) supporting manufacturing efficiency across the domestic automotive compounding, military defense materials, aerospace insulation, electrical wire and cable cladding, and water clarification sectors in the United States. Recognized in domestic...

Synonyms

  • ALUMINUM HYDROXIDE
  • Aluminium hydroxide
  • null
  • Alhydrogel
  • ALternaGEL

Aluminum Hydroxide Specifications

CAS Number
21645-51-2
Molecular Formula
AlH3O3
Molecular Weight
78.004 g/mol
IUPAC Name
aluminum;trihydroxide
Canonical SMILES
[OH-].[OH-].[OH-].[Al+3]
InChI Key
WNROFYMDJYEPJX-UHFFFAOYSA-K
InChI
1S/Al.3H2O/h;3*1H2/q+3;;;/p-3
Molecular Weight
78.004 g/mol
Density
2.42 g/cu cm
Appearance
White, odorless crystalline powder
Specific Gravity
2.42 g/cm3
Bulk Density
~0.3-0.5 g/cms
Mohs Hardness
2.5-3.5
Refractive Index
1.57
Solubility
Insoluble in water, soluble in strong acids and bases
Decomposition
Releases water above 180 °C, converting to alumina (Al, O)
Al(OH), content, Al(OH)3% Purity
Aluminum Hydroxide 99.723 Purity
Moisture (105 °C)
< 0.3%
Na₂O
< 0.3%
Fe₂O₃
< 0.02%
SiO₂
< 0.02%
Loss on ignition (at 1000 °C)
34–35%
Particle Size (median, d50)
ranges from 1 µm (fine grade) to 75 µm (coarse grade)
On heating
Loses water in steps to form active alumina and eventually Al₂O₃
Al(OH)3 Purity (Metallurgy)
99.7 %
SiO2 Purity (Metallurgy)
0.02%
Fe2O3 Purity (Metallurgy)
0.03%
GHS Hazard Statements
H315 (19.7%) Skin corrosion/irritation H319 (21%): Serious eye damage/eye irritation H335 (19.8%): Specific target organ toxicity, single exposure; Respiratory tract irritation
Precautionary Statement Codes
P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501

Halogen-Free Flame Retardancy (ATH)

An endothermic flame retardant and smoke suppressor in polymer formulations by releasing bound water vapor above 200°C to cool the substrate

Thermoset and Solid Surface Filling

A primary functional filler in acrylic, polyester, and epoxy resins to optimise batch stability and scratch resistance in architectural solid surfaces

Zirconia and Alumina Precursor Synthesis

A high-purity raw material for manufacturing activated alumina, sodium aluminate, zeolites, and high-performance synthetic ceramics. Industrial

Water Clarification

An amphoteric coagulant agent in industrial wastewater treatment lines to trap suspended organic macroparticles and dissolved transition metals

Antacid and Pharmaceutical Formulations

Processed under specific dried-gel protocols as a critical buffer agent to neutralise excess stomach acidity and bind phosphates in medical formulations

  1. ALUMINUM HYDROXIDE
  2. Aluminium hydroxide
  3. null
  4. Alhydrogel
  5. ALternaGEL

Aluminum Hydroxide FAQs

Minimum Order Quantity

25 kg (evaluation) · 1 MT (commercial)

Lead Time

3 – 5 weeks estimated

Delivery Terms

FOB*

Packaging

20 L pails, 200 L HDPE drums, 1000 L IBC

US Availability

US Facility Inventory

Documentation

US SDS · COA · TDS · Specification sheet

US Regulatory & Quality Information

TSCA status*

US SDS / HazCom*

GHS classification*

ISO 9001:2015 site*

DOT shipping classification*

FDA status*

EPA status*

California Prop 65*

Reliable US supply chain

Regulatory compliance

On-time delivery

Technical expert support

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