Nitric Acid 25%

Product Overview

Our Nitric Acid 25% (CAS 7697-37-2) is a highly corrosive mineral acid featuring the molecular formula HNO3 and a molecular weight of 63.013. This specific concentration represents a standard aqueous solution used extensively across industrial, manufacturing, and laboratory workflows where controlled acidity and strong oxidizing properties are required. As a primary chemical distributor based in Texas, Alliance Chemical supplies this acids product to support demanding processes ranging from metal surface preparations to chemical syntheses, ensuring a consistent and reliable supply chain for our commercial partners.

Our Nitric Acid 25% is formulated to rigorous industrial standards, providing a balanced solution that minimizes the handling risks associated with more concentrated fuming grades while delivering the chemical activity required for surface passivation, etching, and pH adjustment. Each batch is subjected to thorough quality control protocols to ensure assay accuracy, density conformity, and low trace impurity levels. Industrial buyers rely on this concentration to streamline their internal preparation processes, avoiding the hazards of in-house dilution of highly concentrated acids.

Why This Grade

Selecting a pre-formulated Nitric Acid 25% concentration over stronger options is critical for processes that require precise reaction kinetics and strict temperature management. Operating at a 25% concentration provides a reliable safety margin during exothermic reactions, preventing rapid thermal runaway and excessive nitrogen dioxide outgassing. Many automated dosing systems in chemical manufacturing and metal finishing lines are calibrated specifically for this concentration, where a deviation in acid strength would compromise process control.

Using an incorrect concentration or grade of nitric acid can lead to severe operational failure modes, including the over-etching of delicate substrates, complete destruction of protective passive layers on stainless steel, and accelerated corrosion of process equipment. If a lower grade or contaminated source is introduced, trace metallic impurities can cause catalytic decomposition of neighboring reagents or leave undesirable residues on clean surfaces. By utilizing our standardized 25% concentration, operators ensure predictable passivation rates and protect high-value alloy equipment from catastrophic failure.

Industrial Applications

• Metal passivation and cleaning: Used in the aerospace and marine industries to passivate stainless steel surfaces, removing free iron and preventing corrosion on machined parts.
• Industrial pH adjustment: Serves as a highly effective agent for adjusting pH in large-scale wastewater treatment facilities and chemical manufacturing neutralization processes.
• Semiconductor and electronics etching: Applied as a precise chemical etchant in microelectronics fabrication to clean silicon wafers and prepare semiconductor surfaces for subsequent processing.
• Fertilizer and chemical synthesis: Acts as a crucial intermediate reactant in the production of nitrogen-based compounds, specialized nitrate salts, and organic chemical syntheses.
• Equipment cleaning-in-place (CIP): Utilized in dairy and beverage processing plants to remove inorganic milkstone deposits and mineral scales from stainless steel piping systems.

Hazmat & Shipping

Nitric Acid 25% is classified as a hazardous material for transport and must be handled in strict accordance with Department of Transportation regulations. The canonical transport information designates this material as UN2031, Hazard Class 8, Packing Group II, with the verbatim Proper Shipping Name: Nitric acid, other than red fuming, with less than 65 percent nitric acid. The assigned signal word is Danger. Due to its regulated status, shipping requires specialized packaging, specific hazard labeling, and transport via authorized carriers to ensure compliance and safety throughout the logistics chain.

The GHS classification for this substance contains critical hazard statements, specifically H272, H314, and H330. Consequently, appropriate personal protective equipment (PPE) is mandatory when handling this chemical. Operators must utilize chemical-resistant splash goggles, full face shields, heavy-duty acid-resistant gloves (such as neoprene or nitrile), and protective chemical aprons or full suits. Furthermore, since the substance is fatal if inhaled (H330), processes should be conducted within a certified fume hood or ventilated enclosure, and NIOSH-approved respirators equipped with acid gas cartridges must be readily accessible in accordance with facility exposure control plans.

Handling & Storage

Safe handling of Nitric Acid 25% requires storage in cool, dry, and well-ventilated areas, ideally maintained within a stable temperature range of 50°F to 77°F to prevent thermal stress on containers and vapor pressure accumulation. This corrosive liquid must be kept in compatible containers such as high-density polyethylene (HDPE), fluoropolymer plastics, or glass, and must never be stored in mild steel, copper, or brass vessels. It is critical to segregate this powerful oxidizer from incompatible substances including organic chemicals, combustible materials, strong bases, active metals, and reducing agents, as contact can trigger violent reactions, heat generation, or ignition.

Order & Documentation

Alliance Chemical provides comprehensive documentation and regulatory support for all industrial chemical orders. A Certificate of Analysis (COA) is available upon request for every batch shipped, ensuring trace analysis and concentration accuracy align with your quality management system requirements. Additionally, a detailed Safety Data Sheet (SDS) is provided with every order to support your facility hazard communication program. To secure your supply or to inquire about bulk distribution, please 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.