Sodium Hydroxide 50% Membrane Grade (Caustic Soda, Lye)

Product Overview

Sodium Hydroxide 50% Membrane Grade is a high-purity, aqueous solution of sodium hydroxide (NaOH), commonly referred to as Caustic Soda or Lye. Produced through membrane cell technology, this grade offers a superior impurity profile with significantly lower iron and salt content compared to standard diaphragm grades. It is specifically formulated for industrial applications requiring strict quality control, precise alkalinity, and consistent chemical behavior.

Engineers and plant operators rely on this 50% w/w concentration for efficient mass transfer in bulk reagent systems. As a strong base, it is the standard for heavy-duty industrial neutralization, chemical synthesis, and saponification processes. The solution is clear and colorless, minimizing contamination risks in sensitive manufacturing lines. Alliance Chemical provides this material in scalable pack sizes, from 1-gallon containers to bulk 330-gallon totes, ensuring supply chain continuity for operations of all sizes.

Key Properties

• Product: Sodium Hydroxide 50% (Membrane Grade)
• Chemical Formula: NaOH
• CAS Number: 1310-73-2
• Molecular Weight: 40.00 g/mol
• Appearance: Clear, colorless liquid
• Assay (NaOH): 49% – 51% (Target 50%)
• Specific Gravity: 1.52 – 1.54 at 20°C
• Iron (Fe): < 5 ppm (Low impurity profile)
• Boiling Point: Approx. 145°C (293°F)

Common Applications

• Water Treatment & pH Control: Used extensively to neutralize acidic wastewater, adjust pH in effluent streams, and prevent corrosion in industrial water systems.
• Soap & Detergent Manufacturing: A primary reagent for the saponification of fats and oils to produce high-quality soaps and anionic surfactants.
• Chemical Synthesis: Acts as a reactant and catalyst in the production of organic chemicals, plastics, and synthetic fibers.
• Pulp & Paper Processing: Essential for the digestion of wood pulp and bleaching processes.
• Industrial Cleaning (CIP): Highly effective for degreasing and cleaning process equipment in manufacturing environments due to its ability to hydrolyze proteins and fats.

Safety & Handling

Sodium Hydroxide 50% is a corrosive liquid (UN 1824, Class 8) and requires strict adherence to safety protocols. Personnel must wear full personal protective equipment (PPE), including chemical-resistant gloves, splash goggles, face shields, and impervious aprons. Ensure distinct ventilation during handling to avoid inhalation of mists.

Store in a cool, dry area in corrosion-resistant containers such as HDPE or stainless steel. Keep separated from strong acids, organic materials, and metals like aluminum or zinc to prevent hazardous reactions. In the event of exposure, flush the affected area immediately with copious amounts of water and seek medical attention. Review the Safety Data Sheet (SDS) for complete emergency response and disposal guidelines.

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