Description

Bayerite CAS NO 20257-20-9 is a specific crystalline polymorph of aluminum hydroxide (Al(OH)₃), distinguished by its unique structural properties. This material is valued for its high surface area and chemical reactivity, making it a critical precursor and catalyst support in advanced industrial processes. It is essential for manufacturers and researchers in the ceramics, catalyst, and specialty chemical sectors seeking consistent, high-purity aluminum sources.

Application

• Catalyst and Catalyst Support: Acts as a key precursor for alumina-based catalysts used in petroleum refining, chemical synthesis, and environmental catalysis.
• Ceramics and Advanced Materials: Serves as a starting material for producing high-purity alumina ceramics, sapphire, and other aluminum oxide composites.
• Flame Retardant Filler: Used as a functional filler in polymers and composites, where it decomposes endothermically to release water vapor and suppress flames.
• Adsorbent and Desiccant: Utilized for its high surface area in gas purification, water treatment, and moisture control applications.
• Pharmaceutical and Cosmetic Ingredient: Employed as an antacid or as a raw material in certain pharmaceutical formulations and personal care products.
• Glass and Coating Additive: Functions as a component in specialty glass formulations and surface coatings to modify optical or physical properties.

Basic Information

Product Name	Bayerite
CAS No.	20257-20-9
Molecular Formula	Al(OH)₃ / AlH₃O₃
Molecular Weight	78.00 g/mol
Synonyms	α-Aluminum Trihydroxide; α-Al(OH)₃; Hydrargillite (specific form); Aluminum Hydroxide (Bayerite polymorph); Aluminum(3+) Trihydroxide; Trihydroxyaluminum; C.I. 77002; ATH (when referring to this polymorph)
EINECS	243-670-6

Quality Control

Our Bayerite is produced under a stringent quality management system to ensure batch-to-batch consistency and high purity. Quality parameters, including polymorphic purity, chemical assay, and particle size distribution, are verified against established specifications. A Certificate of Analysis (COA) detailing these results is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed after opening to prevent moisture absorption and caking.

Specification

Item	Specification
Identification (IR)	Conforms
Assay (as Al(OH)₃)	≥ 98.0 %
Polymorphic Purity (XRD)	Predominantly Bayerite phase
Loss on Drying	≤ 2.0 %
Particle Size (D50)	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm
Chloride (Cl)	≤ 0.1 %
Sulfate (SO₄)	≤ 0.1 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.