Description

Aluminum Hydroxide CAS NO 21645-51-2 is a versatile inorganic compound widely used as a flame retardant, filler, and antacid precursor. Its commercial importance stems from its excellent thermal stability, non-toxic nature, and ability to act as a smoke suppressant. This product is essential for manufacturers in the plastics, rubber, pharmaceuticals, and water treatment industries seeking to enhance material safety and performance.

Application

• As a primary flame retardant and smoke suppressant filler in polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate (EVA), and other polymer systems.
• As a raw material for the production of aluminum chemicals, including aluminum sulfate and polyaluminum chloride (PAC) for water purification.
• In the manufacture of antacid medications and as an excipient in pharmaceutical formulations.
• As a filler and reinforcing agent in rubber compounds and cable sheathing to improve flame retardancy.
• In the production of ceramics, glass, and other refractory materials.
• As an adsorbent and clarifying agent in various industrial processes.

Basic Information

Product Name	Aluminum Hydroxide
CAS No.	21645-51-2
Molecular Formula	Al(OH)3
Molecular Weight	78.00 g/mol
Synonyms	Aluminium Trihydroxide; ATH; Hydrated Alumina; Trihydroxyaluminum; Gibbsite; Alumina Trihydrate; Aluminic Acid; Aluminum(III) Hydroxide
EINECS	244-492-7

Quality Control

Our Aluminum Hydroxide is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, particle size distribution, and moisture content. Certificates of Analysis (COA) are provided with every shipment to guarantee traceability and consistency for your production needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); keep the container tightly sealed to prevent absorption of atmospheric moisture, which can affect flow properties and performance.

Specification

Item	Specification
Appearance	White powder
Identification (IR)	Conforms
Assay (as Al(OH)3)	≥ 99.0 %
Loss on Drying	≤ 2.0 %
Particle Size (D50)	1 - 50 µm (Grade Dependent)
SiO2	≤ 0.1 %
Fe2O3	≤ 0.05 %
Na2O	≤ 0.5 %

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