Sodium Hydroxide Flakes ACS Grade

Product Overview

Sodium Hydroxide Flakes ACS Grade, with the chemical formula NaOH, are a highly soluble inorganic base used across diverse industrial and laboratory applications. This product is supplied as white, solid flakes meeting ACS Reagent Grade specifications, designed for reliable performance in chemical synthesis, pH adjustment, and process control. Typical assay values range from 99.0% to 100.5%, reflecting tight quality control suitable for precision work in water treatment, manufacturing, and analytical environments. The material exhibits a high density of approximately 2.13 g/mL at 20°C, reinforcing its robust handling characteristics in dry, controlled environments. In addition to its strong alkalinity and hygroscopic nature, this ACS-grade sodium hydroxide is produced under stringent purity limits to minimize trace contaminants that could impact sensitive processes.

ACS Grade Sodium Hydroxide Flakes are widely used where high-purity caustic strength is required, including saponification in soap production, pH control in water treatment, and base-catalyzed reactions in chemical synthesis. The product’s low residue after ignition and minimized metallic impurities support consistent results in crystallization, polymerization, and analytical workflows. Safety-conscious storage and handling practices, in line with the SDS, ensure optimum shelf life and reduced risk in bulk use scenarios.

Key Properties

• CAS: 1310-73-2
• Appearance: White, solid flakes
• Odor: Odorless
• Solubility: Soluble in water
• Density (25°C): 2.13 g/mL
• Molecular Weight: 40.00 g/mol
• Molecular Formula: NaOH
• pKa: 14.0 (conjugate acid of water) at 25°C
• Assay (Wt %): Min 99.0 – Max 100.5; Typical 99.8; Test method: Titration with standardized HCl or NaOH (back-titration) per ACS/NIST
• Color (APHA/Hazen): Max 10; Typical 5; Test method: Visual comparison
• Specific Gravity (20°C): Min 2.12 – Max 2.14; Typical 2.13; Test method: Density measurement at 20°C
• Residue After Ignition: Max 0.07%; Typical 0.02%; Test method: Gravimetric residue after ignition at 550°C (ACS)
• Chloride (as Cl): Max 0.5 ppm; Typical 0.1 ppm; Test method: IC or argentometric titration
• Nitrate NO₃⁻ (as NO₃): Max 0.5 ppm; Typical 0.1 ppm; Test method: IC
• Ammonium (NH₄⁺): Max 0.5 ppm; Typical 0.1 ppm; Test method: IC or colorimetric assay
• Sulfate (SO₄²⁻): Max 1 ppm; Typical 0.2 ppm; Test method: IC or gravimetric sulfate after combustion
• Phosphate (PO₄³⁻): Max 0.5 ppm; Typical 0.1 ppm; Test method: IC
• Arsenic (As): Max 0.01 ppm; Typical 0.005 ppm; Test method: ICP-MS or ICP-OES
• Heavy Metals (as Pb): Max 0.5 ppm; Typical 0.05 ppm; Test method: ICP-MS or ICP-OES
• Iron (Fe): Max 0.2 ppm; Typical 0.05 ppm; Test method: ICP-OES or colorimetric
• Copper (Cu): Max 0.5 ppm; Typical 0.05 ppm; Test method: ICP-OES or ICP-MS
• Manganese (Mn): Max 0.5 ppm; Typical 0.05 ppm; Test method: ICP-OES or ICP-MS
• Nickel (Ni): Max 0.5 ppm; Typical 0.05 ppm; Test method: ICP-OES or ICP-MS
• Lead (Pb): Max 0.5 ppm; Typical 0.05 ppm; Test method: ICP-OES or ICP-MS
• Zinc (Zn): Max 1 ppm; Typical 0.1 ppm; Test method: ICP-OES or ICP-MS
• Aluminum (Al): Max 1 ppm; Typical 0.1 ppm; Test method: ICP-OES or ICP-MS
• Chromium (Cr): Max 0.5 ppm; Typical 0.05 ppm; Test method: ICP-OES or ICP-MS
• Cobalt (Co): Max 0.5 ppm; Typical 0.05 ppm; Test method: ICP-OES or ICP-MS
• Calcium (Ca): Max 5 ppm; Typical 1 ppm; Test method: ICP-OES or ICP-MS
• Magnesium (Mg): Max 5 ppm; Typical 1 ppm; Test method: ICP-OES or ICP-MS
• Potassium (K): Max 1 ppm; Typical 0.2 ppm; Test method: ICP-OES or ICP-MS
• Sodium (Na): Max 1 ppm; Typical 0.2 ppm; Test method: IC or ICP-OES

Common Applications

• pH Adjustment: Industry: Water Treatment – Neutralizes acidic streams and maintains stable pH in municipal and industrial water processes, enabling corrosion control and process efficiency.
• Chemical Synthesis: Industry: Chemical Manufacturing – Serves as a strong base for multiple reactions, including saponification, hydrolysis, and catalysis in base-mediated pathways.
• Soap Production: Industry: Cosmetics – Essential base for saponification reactions, enabling soap yield optimization and consistent fatty acid conversion.
• Textile Processing: Industry: Textiles – Used in dyeing and finishing to regulate bath pH and enhance color uptake and fiber treatment performance.
• Food Processing: Industry: Food Industry – Applied in controlled pH adjustments and select food additive formulations where caustic conditions are required under regulatory compliance.

Safety Precautions

Handling and storage should follow strict industrial hygiene practices. Store in a cool, dry place in compatible containers (HDPE or glass); keep tightly sealed to prevent moisture uptake and clumping. Use appropriate PPE, including chemical-resistant gloves, splash goggles, and protective clothing to prevent skin and eye contact. Ensure adequate ventilation in storage and handling areas to minimize airborne dust exposure. Follow the SDS and local regulatory requirements when transferring, weighing, or blending the material to avoid exposure and contamination.

Dispose of any waste or residues per applicable regulations. In case of contact with skin or eyes, rinse immediately with plenty of water for at least 15 minutes and seek medical attention if irritation persists. Inhalation precautions should be taken to avoid respiratory exposure; if exposure occurs, move to fresh air and seek medical advice. In the event of ingestion, do not induce vomiting and contact a physician or poison control center immediately. For transportation, adhere to UN 1824, Sodium hydroxide solution, Class 8, PG II guidelines and ensure proper labeling and segregation from incompatibles.

Benefits

✔ High Purity ACS Grade – Consistent assay and low trace metal content support reliable performance in sensitive chemical processes and analytical workflows.
✔ Exceptional Handling Characteristics – Dry, non-clumping flakes with a clear density profile enable predictable feeding and dosing in bulk operations.
✔ Broad Industrial Compatibility – Suitable for pH control, saponification, and base-catalyzed reactions across water treatment, manufacturing, and textiles.