Description

Sodium Alum is a versatile inorganic salt widely utilized for its astringent, clarifying, and pH-buffering properties. This compound is essential in industries where water purification, material finishing, and chemical synthesis are critical processes. Key sectors that rely on this product include water treatment, paper manufacturing, textile processing, and the formulation of certain pharmaceuticals and cosmetics.

Application

• Water Treatment & Purification: Acts as a flocculant and coagulant for clarifying drinking water and treating industrial wastewater.
• Paper Manufacturing: Used in sizing and coating processes to improve paper quality, ink receptivity, and water resistance.
• Textile Industry: Serves as a mordant in dyeing processes to fix colors onto fabrics and as a fire retardant for certain materials.
• Cosmetics & Personal Care: Employed as an astringent and antiperspirant agent in deodorants and skin lotions.
• Pharmaceuticals: Used in some topical astringent preparations and as a clarifying agent.
• Food Industry (FCC Grade): Functions as a firming agent and stabilizer in certain food products (subject to specific grade availability).
• Leather Tanning: Assists in the process of converting raw hides into durable leather.
• Chemical Synthesis: Acts as a catalyst or reagent in various inorganic and organic synthesis reactions.

Basic Information

Product Name	Sodium Alum
CAS No.	10024-42-7
Molecular Formula	NaAl(SO₄)₂·12H₂O
Molecular Weight	458.28 g/mol
Synonyms	Sodium Aluminum Sulfate; SAS; Soda Alum; Aluminum Sodium Sulfate Dodecahydrate; Sodium Aluminium Sulfate; E521 (Food Additive); Natriumaluminiumsulfat; Alun de sodium
EINECS	233-277-3

Quality Control

Our Sodium Alum is manufactured under a stringent quality management system. Each batch is tested to ensure it meets precise specifications for purity, heavy metal content, and other critical parameters. We can supply material compliant with various standards, including FCC (Food Chemicals Codex) for food-grade applications and industrial-grade specifications. A detailed Certificate of Analysis (COA) is provided with every shipment to guarantee traceability and consistent quality.

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 product is hygroscopic (moisture-sensitive) and must be kept away from excessive humidity to prevent caking and degradation.

Specification

Item	Specification
Appearance	Colorless to white crystals or crystalline powder
Identification (IR)	Conforms
Assay (as NaAl(SO₄)₂·12H₂O)	≥ 98.0 %
pH (5% Solution)	2.5 - 4.0
Water Insoluble Matter	≤ 0.2 %
Heavy Metals (as Pb)	≤ 20 ppm
Iron (Fe)	≤ 50 ppm
Chloride (Cl)	≤ 0.1 %

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