Phosphoric Acid 75% USP Food Grade

Product Overview

Phosphoric acid 75% USP (CAS 7664-38-2) is a highly purified, concentrated aqueous solution of orthophosphoric acid, represented by the chemical formula H3O4P with a molecular weight of 97.995 g/mol. As an essential mineral acid, this clear, odorless, and colorless liquid is widely utilized across diverse technical and industrial sectors where high-purity chemical processing is mandatory. Alliance Chemical distributes this high-specification acid to meet the stringent demands of modern manufacturing, ensuring consistent density and pH profiles across every delivered volume. Users can easily browse our extensive catalog of industrial acids to find the ideal strength for their specific applications.

Operating as a reliable Texas-based chemical supplier, we focus on delivering raw materials that satisfy strict purity benchmarks. This 75% concentration provides an optimal balance of active chemical strength and manageable viscosity, making it highly efficient for dilution, neutralization, and formulation tasks. Unlike weaker concentrations, the 75% variant minimizes water content, reducing freight costs and storage space requirements while maintaining a stable liquid state at standard operating temperatures. Every shipment is carefully managed to preserve chemical integrity from our facility to your receiving dock, backed by comprehensive quality control documentation.

Why This Grade

Utilizing the USP grade of phosphoric acid ensures an exceptionally low threshold of heavy metals, arsenic, and other impurities that are commonly found in technical or agricultural grades. In high-precision manufacturing processes, even minuscule trace contaminants can catalyze unwanted side reactions, degrade sensitive process equipment, or compromise the final product's quality. This specific high-purity grade is formulated to meet the exact standards required by sensitive industrial workflows, providing peace of mind for quality assurance teams who require uncompromised chemical purity. Selecting a lesser grade can lead to costly batch failures, precipitate formation, or unexpected shifts in chemical behavior during critical production steps.

Choosing a 75% concentration over other variations like 85% or 50% is critical for specific thermal and operational parameters. The 75% solution has a lower freezing point than the highly concentrated 85% version, which is prone to crystallization at cooler room temperatures—a physical transition that complicates handling and requires heated storage solutions. Conversely, using a weaker 50% solution introduces excess water into chemical formulations, which can dilute active mixtures and throw off precise stoichiometry in manufacturing. This balanced 75% formulation prevents these operational failure modes, offering reliable liquid stability and high reaction efficiency without the risk of premature crystallization or unwanted water volume.

Industrial Applications

• Metal preparation and rust removal — Phosphoric acid is applied to steel surfaces in metal finishing workflows to remove rust and form a protective iron phosphate coating that enhances corrosion resistance.
• Industrial pH neutralization — Used extensively in wastewater neutralization and chemical processing facilities to neutralize alkaline streams and maintain precise pH levels in process water.
• Chemical synthesis and catalyst agent — Acts as an essential catalyst or reagent in the production of various phosphate salts, esters, and synthetic compounds in manufacturing.
• Anodizing and metal polishing — Utilized in electrochemical polishing baths for aluminum and other metals to create smooth, reflective surfaces by selectively dissolving microscopic high points.
• Detergent and cleaning formulations — Incorporated into industrial-strength descaling agents and specialized cleaners to dissolve mineral deposits, hard water scale, and metal oxides from process piping.

Hazmat & Shipping

Phosphoric Acid 75% USP is a regulated hazardous material due to its corrosive properties. For transport, it is classified under DOT regulations as UN1805, Hazard Class 8 (Corrosive), Packing Group III. The proper shipping name is PHOSPHORIC ACID SOLUTION. The GHS signal word is Danger, reflecting its potential to cause severe skin burns and eye damage. To ensure full compliance and safety, all shipments are handled by authorized carriers in accordance with strict DOT hazmat standards. Our robust packaging is designed to withstand the physical demands of transit, preventing leaks and exposure.

When handling this corrosive liquid, personnel must wear appropriate personal protective equipment (PPE) to mitigate risks associated with GHS hazard statement H314. Required safety gear includes chemical-resistant gloves (such as neoprene or nitrile), protective clothing, and a full-face shield or splash goggles to protect eyes and skin from accidental contact. Work areas must be equipped with functioning eye wash stations and safety showers. To review detailed safety parameters, toxicity metrics, and emergency response procedures, please consult the product's SDS. Alliance Chemical includes an SDS with every order and maintains a library of documentation for ongoing compliance support.

Handling & Storage

Store phosphoric acid 75% in a cool, dry, well-ventilated area, ideally at temperatures above its crystallization point of approximately 108 °F (though the 75% solution remains liquid at much lower temperatures than the pure solid or 85% forms). Suitable container materials include high-density polyethylene (HDPE), polypropylene, or specially lined steel, as the acid is highly corrosive to metals such as mild steel, aluminum, and brass. Keep containers tightly closed when not in use and store them away from incompatible substances, including strong bases, strong oxidizing agents, and active metals. Proper secondary containment should be implemented to prevent environmental release in the event of a spill.

Order & Documentation

At Alliance Chemical, we simplify procurement by offering multiple packaging sizes to match your specific operational demands. Whether you require single quarts, multiple gallons, or bulk quantities, our team is prepared to fulfill your order with speed and precision. A Certificate of Analysis (COA) is available upon request for every batch, ensuring full traceability and quality verification. To discuss your requirements, request bulk pricing, or obtain technical documentation, please contact our support team. Request a Quote and Download the SDS today.

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.