Product Overview
Phosphoric Acid 30% is an industrial-strength solution designed for surface preparation and scale removal. Alliance Chemical provides this standard dilution to support diverse commercial operations without the need for in-house mixing of concentrated acids. Formulated with pure raw materials, this clear, odorless liquid ensures uniform consistency across multiple applications, particularly in metal treatment where precise chemical activity is critical for achieving optimal finish quality. It is a reliable choice for operations requiring controlled acidity and a consistent reaction profile.
This aqueous solution contains 30% active phosphoric acid — CAS 7664-38-2 — presenting a balanced concentration that balances chemical efficiency with manageable handling profiles. For facility managers and industrial technicians, utilizing a pre-diluted 30% concentration reduces the hazards associated with diluting highly concentrated acids in-house — preventing exothermic reactions and potential splash hazards. Alliance Chemical packages this product in various sizes to support your operations, ensuring that your facility receives a consistent, high-purity product tailored to your specific process volume needs. You can browse our complete catalog of industrial acids to find the exact formulation for your requirements.
Why This Grade
Selecting a 30% concentration of phosphoric acid is essential for applications where stronger formulations would cause excessive substrate damage, and weaker dilutions would fail to achieve the required reaction rate. This concentration is widely specified for surface etching, rust conversion, and mineral descaling on steel and iron substrates. Utilizing the incorrect concentration introduces significant failure modes into industrial processes. For example, using a concentration that is too low will lead to incomplete rust conversion, leaving active iron oxides underneath coatings that ultimately cause premature paint adhesion failure.
Conversely, deploying a highly concentrated acid on delicate metallic surfaces can lead to aggressive pitting, hydrogen embrittlement, and rapid substrate degradation, ruining the dimensional tolerance of precision components. By specifying Alliance Chemical's 30% solution, operators access an optimized chemical profile that reacts efficiently with iron oxides without compromising the structural integrity of the underlying base metal. This concentration ensures uniform phosphate conversion coating, which is crucial for subsequent powder coating or painting operations in manufacturing environments.
Chemical Profile
- CAS Number
- 7664-38-2
- Chemical Formula
- H3PO4
- Molecular Weight
- 97.995 g/mol
- Boiling Point
- greater than 266 °F at 760 mmHg (USCG, 1999)
- Melting Point
- 108 °F (NIOSH, 2024)
- Flash Point
- 200 °C
- Specific Gravity
- 1.892 at 77 °F (USCG, 1999) - Denser than water; will sink
- Appearance
- Phosphoric acid appears as a clear colorless liquid or transparent crystalline solid. The pure solid melts at 42.35 °C and has a density of 1.834 g / cm3. Liquid is usually an 85% aqueous solution. Shipped as both a solid and liquid. Corrosive to metals and tissue. Used in making fertilizers and detergents and in food processing.
- Solubility
- Miscible (NIOSH, 2024)
- UN Number
- UN1805
- Hazard Class
- Class 8
- Packing Group
- III
- Proper Shipping Name
- Phosphoric acid solution
- GHS Signal Word
- Danger
Values sourced from Alliance Chemical's canonical chemistry registry. Certificate of Analysis (COA) per lot.
Industrial Applications
This acid is widely utilized across several key sectors, particularly in surface preparation applications:
- Steel surface preparation and rust conversion to form a protective iron phosphate coating prior to industrial powder coating processes.
- Heavy-duty mineral scale removal in industrial boilers, heat exchangers, and commercial cooling towers to restore optimal thermal transfer efficiency.
- Wastewater pH adjustment and chemical neutralization in industrial effluent treatment plants to meet strict state and federal discharge requirements.
- Concrete floor etching in commercial warehouse facilities to ensure superior mechanical adhesion for protective epoxy and urethane coatings.
- Metal cleaning and chemical passivation of industrial machinery components to prevent flash rust during transport and extended warehouse storage.
Hazmat & Shipping
Phosphoric Acid 30% is a regulated hazardous material due to its corrosive properties. For transport, it is classified as UN1805, Hazard Class 8, Packing Group III. The proper shipping name is Phosphoric acid solution. With a signal word of Danger, this material requires compliant labeling and documented handling procedures during transport. Alliance Chemical ensures all shipments strictly adhere to DOT regulations, utilizing authorized shipping containers and certified hazmat carriers to guarantee safe delivery to your facility.
In accordance with GHS classification and the primary hazard statement H314, which notes that it causes severe skin burns and eye damage, operators must utilize appropriate personal protective equipment (PPE). When handling this chemical, personnel must wear acid-resistant gloves, chemical splash goggles, a full-face shield, and a protective apron to prevent direct skin or eye contact. Ensure the working environment is equipped with a functioning eyewash station and safety shower. Consult the Safety Data Sheet (SDS) provided with every order for detailed safety and spill mitigation protocols.
Handling & Storage
Proper storage of Phosphoric Acid 30% is critical to maintaining chemical stability and preventing accidental releases. This solution should be stored in a cool, dry, well-ventilated area, ideally within a temperature range of 50°F to 104°F to avoid extreme temperatures. Keep the container tightly closed when not in use. It is highly compatible with high-density polyethylene (HDPE) and polypropylene containers, but it must never be stored in mild steel, aluminum, or galvanized containers due to corrosive reactions. Avoid contact with incompatible substances such as strong bases, strong oxidizing agents, and active metals.
Order & Documentation
Alliance Chemical provides reliable logistics and comprehensive support for your bulk chemical requirements. We offer rapid lead times and flexible packaging options to support your facility's operational needs. A Certificate of Analysis (COA) is available upon request to verify purity, and a Safety Data Sheet (SDS) is provided with every order to assist with your regulatory compliance programs. Please Request a Quote for bulk pricing or Download the SDS to review safety protocols.
Why Buy from Alliance Chemical
Since 1998, 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.
