Aluminum Sulfate Hydrate ACS Grade

Product Overview

Aluminum Sulfate Hydrate ACS Grade (Al₂(SO₄)₃·xH₂O), commonly known as Alum or Filter Alum, is a white crystalline solid manufactured to meet American Chemical Society (ACS) specifications. This high-purity salt is characterized by strict limits on heavy metals and iron content, making it superior to technical grade alternatives for sensitive applications. It functions primarily as a powerful coagulating agent and precipitant in aqueous systems.

With a typical assay of 99.8%, this ACS Reagent Grade material ensures consistent reaction stoichiometry in laboratory analysis and industrial formulation. Its high solubility facilitates rapid dispersion for water treatment flocculation, while its acidic nature makes it effective for pH adjustment in alkaline environments. The low iron content (typical 0.5 ppm) prevents staining in paper manufacturing and textile dyeing processes.

Key Properties

• Appearance: White, lustrous crystals or powder
• Grade: ACS Reagent Grade (≥98.0%)
• CAS Number: 7784-31-8
• Solubility: Highly soluble in water; insoluble in alcohol
• pH: Acidic in aqueous solution
• Specific Gravity: ~1.69
• Iron (Fe): <0.002% (Low Iron)
• Heavy Metals (as Pb): <0.001%

Common Applications

• Water Treatment: Functions as a primary coagulant to destabilize colloidal suspensions, remove turbidity, and reduce phosphate levels in municipal and industrial wastewater treatment.
• Paper Manufacturing: Acts as a sizing agent and retention aid, improving paper strength and water resistance while controlling pitch.
• Textile Processing: Used as a mordant in dyeing operations to fix dyes to fibers and enhance color fastness.
• Laboratory Reagent: Serves as a standard in analytical chemistry and chemical synthesis requiring high-purity aluminum sources.
• pH Control: utilized to lower pH in garden soils (acidifying agent) and industrial process streams.

Safety Precautions

Aluminum Sulfate is an acidic salt and can cause eye and skin irritation. Wear appropriate Personal Protective Equipment (PPE), including safety goggles, chemical-resistant gloves, and a dust mask when handling solid crystals to prevent inhalation. Store in a cool, dry area away from incompatible materials such as strong oxidizers and alkalis. Moisture absorption can cause caking; keep containers tightly sealed when not in use. Refer to the Safety Data Sheet (SDS) for detailed handling and emergency instructions.

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