Chemical laboratory

Sodium Hydroxide Membrane Caustic Soda Lye

High-Purity Alkaline Solution for Industrial Applications

  • CAS 1310-73-2
  • Formula NaOH
  • Flash Pt N/A °C
  • Density 2.13 g/cm³
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Physical & Chemical Properties

Property Value Unit
Boiling point 1388°C °C
Flash point N/A °C
Density 2.13 g/cm³ g/cm³
Solubility 111 g/100 mL (20°C) -
Ph > 14 (1 M solution) -
Molecular weight 40.00 g/mol g/mol
Melting point 12°C (for 50% solution) °C
Vapor pressure N/A mmHg
Autoignition temp N/A -
Appearance Clear, colorless liquid -
Odor Odorless -
Vapor density N/A g/cm³

Overview

Sodium Hydroxide Membrane Caustic Soda Lye (CAS 1310-73-2) is a clear, colorless, odorless alkaline solution with exceptional purity and consistent quality. This highly concentrated sodium hydroxide solution is produced using advanced membrane cell technology, ensuring minimal impurities and superior performance across diverse industrial applications. With its extremely high pH (>14 in 1M solution) and excellent solubility characteristics, this caustic soda lye serves as an essential chemical building block for numerous manufacturing processes.

Key Applications

  • Chemical Manufacturing: Critical raw material for producing various organic and inorganic chemicals, serving as a strong base in synthesis reactions and neutralization processes
  • Pulp and Paper Industry: Essential for kraft pulping processes, delignification, and bleaching operations, helping break down lignin and separate cellulose fibers
  • Water Treatment: Highly effective for pH adjustment in municipal and industrial water treatment systems, neutralizing acidic wastewater and precipitating heavy metals
  • Aluminum Production: Key component in bauxite ore processing and alumina refining through the Bayer process, dissolving aluminum hydroxide from ore

Safety & Handling

This product requires careful handling due to its highly corrosive nature and extreme alkalinity. While it has no flash point and is non-flammable, sodium hydroxide lye can cause severe chemical burns on contact with skin or eyes. Essential personal protective equipment includes chemical-resistant gloves, safety goggles, face shields, and acid-resistant clothing. Ensure adequate ventilation when handling to prevent inhalation of any potential mists or vapors. Emergency eyewash stations and safety showers should be readily accessible in work areas.

Storage & Shelf Life

Store in original containers made of compatible materials such as steel, polyethylene, or fiberglass. Avoid aluminum, zinc, tin, and other reactive metals that can corrode in alkaline environments. Maintain storage temperatures between 15-30°C to prevent crystallization or thermal degradation. Keep containers tightly sealed and away from acids, organic materials, and moisture-sensitive compounds. The product has an indefinite shelf life when stored properly under recommended conditions.

Why Alliance Chemical

Alliance Chemical provides reliable supply of Sodium Hydroxide Membrane Caustic Soda Lye with same-day shipping from our Taylor, Texas facility. We offer flexible delivery options including UPS for smaller quantities and LTL/FTL freight for bulk orders. Every shipment includes comprehensive Safety Data Sheets (SDS) and Certificates of Analysis (COA) to ensure product quality and regulatory compliance for your operations.

Shipping & Availability

Parcel Shipping

UPS Ground supports pints, quarts, and most 1-gallon packages nationwide.

LTL Freight

5-gallon pails, drums, and totes move via LTL carriers such as ABF Freight, SEFL, Saia, and XPO.

Full Truckload

FTL available for palletized bulk orders. Competitive freight rates.

Local Pickup

Same-day pickup at our Taylor, TX warehouse for Texas customers.

SDS, COA, and TDS available for every product • Same-day shipping on orders before 1 PM CT

Frequently Asked Questions

What is Sodium Hydroxide Membrane (Caustic Soda, Lye) and what is it used for?
Sodium Hydroxide Membrane (CAS 1310-73-2, formula NaOH) is a high-purity caustic soda solution produced by the membrane electrolysis process, typically supplied at 50% w/w. It is used as a strong alkali in industrial processes such as chemical synthesis, pulp and paper, textiles, soap and detergent manufacture, metal processing and laboratory reagents.
How should 50% sodium hydroxide membrane be stored and what is its shelf life?
Store in a cool, dry, well-ventilated area in compatible, tightly closed containers away from acids and incompatible metals; avoid exposure to carbon dioxide and moisture. The solution is chemically stable under proper storage and typically retains quality for long periods, though suppliers recommend stock rotation and checking the certificate of analysis; many users plan for use within 12–24 months.
What safety precautions and PPE are required when handling 50% caustic soda?
Sodium hydroxide 50% is highly corrosive and requires alkali-resistant gloves (neoprene or nitrile), chemical splash goggles or face shield, long-sleeved chemical-resistant clothing, and access to emergency eyewash and shower facilities. In case of contact, flush affected area with plenty of water and seek medical attention; ensure adequate ventilation to avoid inhalation of mists.
What is the difference between 50% membrane caustic and other concentrations or production grades?
The 50% designation refers to weight percent NaOH in water and is a common concentrated industrial grade; membrane-process caustic is characterized by low chloride and impurity levels compared with diaphragm or mercury-process grades. Lower or higher concentrations are used for specific applications, with handling and material compatibility changing as concentration and temperature vary.
What documentation can I request for sodium hydroxide membrane (SDS, COA, TDS)?
Suppliers typically provide a Safety Data Sheet (SDS), Certificate of Analysis (COA) showing purity and impurities, and a Technical Data Sheet (TDS) on request; additional documents such as transport declarations, material declarations, or test reports can often be supplied for regulatory or quality audits. Always review the SDS before handling.
How is 50% caustic soda shipped and what packaging options are standard?
50% sodium hydroxide is classified as UN 1823, Class 8 corrosive, and is shipped under regulated corrosive-material rules. Common packaging includes HDPE drums, 250–1000 L IBCs, and tankers; compatible carriage and proper labeling are required for transport.
Which materials are compatible or incompatible with sodium hydroxide solutions?
Compatible materials for 50% NaOH at ambient conditions include stainless steels (e.g., 316 under controlled conditions), nickel alloys, HDPE, polypropylene, PTFE and glass. Incompatible materials include aluminum, zinc, tin, copper, brass and galvanized steels, which can corrode or generate hydrogen; check compatibility for elevated temperatures and concentrations.
What are the key technical specifications for 50% membrane sodium hydroxide?
Typical specifications include CAS 1310-73-2, formula NaOH, nominal concentration 50% w/w, appearance: clear to slightly yellow viscous liquid, and density approximately 1.52 g/cm3 at 20°C; membrane grade generally has low chloride and trace metals. Exact specs (purity, chloride, metals) vary by supplier and are provided on the COA.
Which industries and applications commonly use 50% membrane caustic?
Common industries include pulp and paper (delignification and chemical recovery), chemicals and specialty manufacturing, textiles (scouring and mercerizing), soap and detergent production, water treatment, petroleum refining and metal processing (alkaline cleaning and etching). It is also used as a reagent in laboratories and intermediate chemical manufacture.
How can I purchase 50% sodium hydroxide membrane and what is typical availability and lead time?
50% membrane caustic is widely available from chemical distributors and bulk suppliers; packaging options and minimum order quantities vary by vendor. Stock availability and lead times depend on region, order size and logistics, so contact suppliers with required volume, packaging preference and delivery location for pricing and lead-time confirmation.

Documentation & Downloads

Safety Data Sheet
SDS / MSDS
Request COA
Certificate of Analysis
Technical Data Sheet (TDS)
Available for all products

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