Aluminum Hydroxide Powder, Reagent Grade — Al(OH)₃, CAS 21645-51-2
Fine dried gel powder. High-surface-area aluminum hydroxide for manufacturing and research applications.Dried Aluminum Hydroxide Gel — Reagent Grade
Dried Aluminum Hydroxide Gel is a high-purity, fine white powder composed of amorphous aluminum hydroxide [Al(OH)3] produced by controlled precipitation and gentle drying. Unlike conventional ATH (aluminum trihydrate) ground from bauxite refining streams, gel-grade aluminum hydroxide is precipitated as a colloidal gel and then dried, which gives it an exceptionally high specific surface area, fine and uniform particle size, and high reactivity. This makes it the preferred grade for applications where adsorption capacity, acid-neutralizing power, or fine-particle dispersion matter more than bulk density.
This material is sold as reagent grade — for research, manufacturing, or repackaging only. Not for direct pharmaceutical, food, or medical device use.
Product Specifications
| Chemical Name | Aluminum hydroxide, dried gel |
| Synonyms | Algeldrate, ATH gel, hydrated alumina gel |
| CAS Number | 21645-51-2 (also referenced as 1339-92-0 for the hydrated gel form) |
| Molecular Formula | Al(OH)3 |
| Molecular Weight | 78.00 g/mol |
| Al2O3 Equivalent Content | ~ 47 – 60 % |
| Appearance | Fine, free-flowing white powder, odorless |
| Tapped Density | 0.3 – 0.7 g/mL |
| Particle Size (D50) | ~ 25 µm |
| Solubility | Insoluble in water; soluble in strong acids and alkalis (amphoteric) |
| pH (Aqueous Suspension) | ~ 8 – 10 |
| Loss on Drying | Low (dried gel form) |
| DOT Classification | Not regulated — non-hazardous for transport |
| Origin | Manufactured in the USA (Lewes, DE) |
Applications and Benefits:
- Laboratory research and R&D reference material for analytical method development, formulation prototyping, adsorption studies, and synthesis of derived alumina phases.
- Flame retardant and smoke suppressant filler for polymer composites, rubber compounds, wire insulation, and engineered plastics.
- Functional additive in cosmetic and personal care manufacturing including deodorants, dusting powders, and facial masks.
- Substrate material for aluminum lake pigment and color manufacturing in inks, coatings, and decorative products.
- Catalyst support and adsorbent precursor for petrochemical processing and water treatment applications.
- High-purity alumina source for ceramics, porcelain, refractories, glass, and glaze formulations.
- Reinforcing and extending filler in adhesives, sealants, epoxy systems, and specialty coatings.
- Coating pigment and filler for specialty paper applications requiring opacity and smoothness.
- Suitable for manufacturing and laboratory repackaging while maintaining lot traceability and CoA integrity.
Caution:
Store in original sealed container in a cool, dry, well-ventilated area away from strong acids and moisture. Keep container tightly closed when not in use. Use NIOSH-approved dust mask, gloves, and safety glasses during handling. Powder may cause mechanical irritation to eyes and respiratory tract. Surface may become slippery if spilled. Shelf life is typically 3 years from manufacture date when stored properly; re-testing recommended thereafter.
Material is sold as reagent-grade chemical for research, manufacturing, or repackaging use only. Buyer is responsible for verifying suitability for intended applications through independent testing and re-certification where required. Not sold for direct pharmaceutical, food, dietary supplement, or medical device end-use.
- Availability: In Stock
- Model: ALHYDGEL
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