Sodium Hydroxide 25% ACS Grade

Description

Product Overview

Sodium Hydroxide 25% ACS Grade is a highly purified aqueous solution of sodium hydroxide — a vital reagent in analytical chemistry, industrial synthesis, and chemical research. Known colloquially as caustic soda, this strongly alkaline liquid solution is prepared with strict adherence to rigorous quality standards — ensuring minimal trace impurities. By maintaining a stable 25% concentration, Alliance Chemical provides a reliable, pre-diluted form of this strong base, eliminating the hazards and thermal energy spikes associated with dissolving solid sodium hydroxide pellets in water.

For industrial facilities, municipal operations, and research laboratories, having access to a pre-formulated 25% concentration is highly advantageous. This precise formulation ensures consistent batch chemistry, predictable reaction rates, and simplified handling during fluid dosing. The solution appears as a colorless and odorless liquid, though it remains significantly denser than water, requiring appropriate agitation and storage setups. Safety remains a primary concern during handling, as this corrosive agent can severely irritate or damage biological tissue upon contact. You can browse our full range of bases or view other sodium hydroxide solutions to find the exact chemical concentration for your facility.

Why This Grade

ACS Grade chemical solutions are manufactured to meet the rigorous specifications established by the American Chemical Society, capping metallic impurities, chlorides, and silicates at exceptionally low parts-per-million levels. In high-precision processes, choosing the correct analytical grade is critical because any excess trace contaminants can poison expensive catalysts or distort spectroscopic baselines. A 25% concentration provides a balance between alkalinity and viscosity, facilitating easier pumping and dosing through automated systems compared to highly viscous 50% solutions.

Selecting an incorrect grade or concentration can introduce severe operational failure modes in critical chemical pathways. For instance, using a technical or industrial grade in analytical testing can yield false positives during trace element detection, potentially invalidating research protocols. Furthermore, attempting to use an incorrect concentration can lead to uncontrolled pH spikes or exothermic boiling, risking equipment failure. Alliance Chemical ensures that our ACS Grade material maintains the stringent purity required to prevent these chemical interferences and system-wide failures.

Chemical Profile

CAS Number

1310-73-2

Chemical Formula

HNaO

Molecular Weight

39.997 g/mol

Boiling Point

Not characterized for the solution

Melting Point

Not characterized for the solution

Specific Gravity

1.27 (denser than water)

Appearance

Sodium hydroxide solution appears as a colorless liquid. More dense than water. Contact may severely irritate skin, eyes, and mucous membranes. Toxic by ingestion. Corrosive to metals and tissue.

Solubility

111 % (NIOSH, 2024)

UN Number

UN1824

Hazard Class

Class 8

Packing Group

II

Proper Shipping Name

SODIUM HYDROXIDE SOLUTION

GHS Signal Word

Danger

Values sourced from Alliance Chemical’s canonical chemistry registry. Certificate of Analysis (COA) per lot.

Industrial Applications

• Chemical Synthesis and pH Regulation: It acts as an essential reactant in neutralizing acidic waste streams and adjusting pH levels in complex organic synthesis pipelines.
• Water Treatment and Municipal Purification: This solution is extensively utilized for controlling alkalinity and heavy metal precipitation in industrial wastewater treatment facilities.
• Soap and Detergent Manufacturing: Serving as a primary alkaline source for saponifying fats and oils, it helps produce high-quality cleaning agents and surfactants.
• Textile Processing and Mercerization: The solution is employed in treating cotton and wood pulp, increasing fiber strength, luster, and dye absorption capacities.
• Metal Finishing and Etching: Industrial operations use it to degrease, clean, and etch metal surfaces prior to electroplating, anodizing, or protective coating application.

Hazmat & Shipping

Due to its corrosive properties, Sodium Hydroxide 25% ACS Grade is classified as a regulated hazardous material for transportation. Under Department of Transportation guidelines, it is shipped as UN1824, Hazard Class 8, Packing Group II, with the proper shipping name SODIUM HYDROXIDE SOLUTION. The canonical GHS signal word is Danger. Container labels carry GHS pictograms: not applicable. Standard shipping protocols require specialized, heavy-duty packaging to prevent leaks, ensuring safe transport across our national distribution network. Every shipment is accompanied by a comprehensive Safety Data Sheet (SDS) that details spill containment and emergency response procedures.

Appropriate personal protective equipment (PPE) is mandatory when handling this material, specifically dictated by GHS codes H290 (corrosive to metals) and H314 (causes severe skin burns and eye damage). Workers must wear chemical-resistant gloves, splash-resistant goggles, a face shield, and protective garments to avoid any direct skin or eye contact. If an accidental spill occurs, neutralize with a weak acid solution or absorb with non-combustible materials as specified in the SDS. Always maintain a readily accessible eyewash station and safety shower in areas where this corrosive base is processed.

Handling & Storage

Safe handling of this alkaline liquid requires storage in a cool, dry, well-ventilated area, preferably within a temperature range of 60°F to 85°F to prevent freezing or crystallization. Sodium hydroxide is highly corrosive to metals such as aluminum, zinc, and tin, which can release flammable hydrogen gas upon contact; therefore, compatibility with storage tanks made of polyethylene, polypropylene, or lined steel is vital. Keep containers tightly closed to prevent the absorption of atmospheric carbon dioxide, which degrades the solution into sodium carbonate, and store far away from strong acids and oxidizing agents.

Order & Documentation

At Alliance Chemical, we ensure complete transparency and documentation for all our products. A Certificate of Analysis (COA) is available upon request to verify the purity, and a comprehensive Safety Data Sheet (SDS) is provided with every order to support your facility compliance goals. To secure your supply or clarify handling requirements, you can Request a Quote or Download the SDS.

Why Buy from Alliance Chemical

Since 1997, Alliance Chemical has supplied premium industrial chemicals from Taylor, Texas under CAGE Code 1LT50, with a COA and SDS included on every order. For industrial use only.

Related reading: Sodium Hydroxide in Direct Air Capture — how sodium hydroxide captures carbon dioxide in direct air capture, the regeneration loop, and which grade fits.