Product Overview
Phosphoric Acid 75% is a highly stable, concentrated mineral acid widely utilized across multiple industrial sectors. Formulated as a clear, odorless, and colorless liquid, this aqueous solution provides a reliable source of orthophosphoric acid for diverse chemical applications. As a Texas-based industrial distributor, Alliance Chemical supplies this product to meet the rigorous specifications required for technical, manufacturing, and agricultural processes. The 75% concentration balance ensures manageable viscosity and high chemical activity, making it a preferred choice over weaker solutions for demanding pH adjustment and metal treatment operations.
Our Phosphoric Acid 75% is designed for professional operators who require precise chemical performance. Characterized by its high density and low vapor pressure, this chemical offers excellent thermal stability and remains fully miscible in water. We recommend referencing the safety protocols outlined in the documentation before handling this strong acid. Alliance Chemical maintains strict quality control measures to ensure that each batch is consistent, reliable, and delivered safely to your facility. We provide a comprehensive Safety Data Sheet (SDS) provided with every order to support your facility’s hazard communication program.
Why This Grade
Choosing the 75% concentration of phosphoric acid is critical for processes that demand specific chemical kinetics without the excessive crystallization risks associated with higher concentrations like 85%. This concentration offers an optimal balance of orthophosphoric acid activity and fluid mechanics, ensuring smooth flow rates through industrial dosing pumps and piping networks. Utilizing a lower concentration would require transporting excess water, increasing logistics costs and diluting reactive mixtures beyond functional limits. Selecting the exact 75% concentration ensures your chemical reactions proceed at calculated rates without unnecessary dilution variables.
Using an incorrect grade or concentration of phosphoric acid can lead to severe operational failures. If a higher concentration is used, crystallization may occur in cooler climates, leading to clogged lines and damaged transfer equipment. Conversely, using a weaker or less controlled grade can introduce trace impurities that interfere with chemical synthesis, metal finishing, or catalyst preparation. In critical industrial manufacturing, these impurities can cause surface staining or compromise the integrity of rust conversion coatings. Alliance Chemical ensures that our 75% concentration remains within strict tolerances to eliminate these risks, and a Certificate of Analysis (COA) is available upon request to verify composition.
Chemical Profile
- CAS Number
- 7664-38-2
- Chemical Formula
- H3O4P
- 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
- 210 °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
- Metal Surface Treatment: Used as an effective rust converter and steel etchant to prepare metal components for painting, phosphating, or industrial coating applications. Learn more about our surface treatment options in our acids collection.
- Agricultural Formulation: Serves as a primary component in the synthesis of concentrated phosphate fertilizers and liquid nutrients designed for soil pH correction.
- Chemical Manufacturing: Acts as a critical reactant and catalyst in the production of various industrial phosphate salts, esters, and specialty chemicals.
- Wastewater Treatment: Utilized as a nutrient feed for biological treatment systems to maintain proper phosphorus levels and to neutralize alkaline waste streams.
- pH Regulation: Employed in industrial water systems and manufacturing processes where precise, stable pH adjustment is required without introducing volatile chloride ions. You can view all specialized solutions on our water treatment industry page.
Hazmat & Shipping
Phosphoric Acid 75% is classified as a hazardous material for transportation and handling. According to shipping regulations, this product is classified under UN1805, Hazard Class 8, Packing Group III. The proper shipping name is PHOSPHORIC ACID, SOLUTION. The signal word for this chemical is Danger. It is highly corrosive to metals and can cause severe skin burns and eye damage, as indicated by the hazard statement H314. Consequently, transport and delivery must comply with all local, state, and federal Department of Transportation (DOT) regulations for hazardous materials.
Due to these hazards, appropriate personal protective equipment (PPE) is strictly required when handling this substance. Personnel must wear chemical-resistant gloves, protective clothing, and eye or face protection as designated by precautionary statements P260, P264, and P280. In case of exposure, follow the emergency procedures outlined in safety guidelines, such as P301+P330+P331 for ingestion or P305+P354+P338 for eye contact. Alliance Chemical ships this regulated product in approved containment systems, from quart bottles to large drums. Always review the Safety Data Sheet (SDS) provided with every order to ensure full compliance with facility safety protocols.
Handling & Storage
Proper storage of Phosphoric Acid 75% is essential to prevent container degradation and hazardous reactions. Store this liquid in a cool, dry, well-ventilated area, ideally maintaining temperatures above its freezing point of 108 °F (NIOSH, 2024) to prevent crystallization, while avoiding extreme heat. It must be kept in compatible, corrosion-resistant containers such as high-density polyethylene (HDPE) or glass — contact with incompatible metals can generate flammable hydrogen gas. Keep containers tightly sealed and away from strong bases, active metals, and oxidizing agents to ensure chemical stability and prevent accidental releases.
Order & Documentation
Alliance Chemical offers Phosphoric Acid 75% in several convenient packaging sizes to accommodate both laboratory work and large-scale industrial manufacturing. To assist your quality control and compliance teams, a Certificate of Analysis (COA) is available upon request, and a Safety Data Sheet (SDS) is provided with every order. If you need pricing for bulk quantities or have specific packaging requirements, please Request a Quote today or Order Phosphoric Acid 75% directly from our online catalog.
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.
