Phosphoric Acid 75%

Product Overview

Phosphoric Acid 75% is a clear, colorless liquid solution of Orthophosphoric Acid (H3PO4) tailored for industrial and manufacturing applications. This Technical Grade concentration provides a balance of acid strength and viscosity, making it easier to pump and handle in cooler environments compared to higher concentrations. It offers robust buffering capacity and controlled acidity for pH adjustment, chemical synthesis, and metal surface treatment.

The 75% solution is formulated to deliver consistent titratable acidity and low visual color, ensuring reproducible results in critical formulations. Its density and viscosity are suitable for reliable dosing in closed systems. Alliance Chemical provides this product in specific pack sizes ranging from 1 gallon to bulk totes to meet the needs of facility managers and process engineers.

Key Properties

• Chemical Formula: H3PO4
• CAS Number: 7664-38-2
• Molecular Weight: 97.99 g/mol
• Boiling Point: 158 °C
• Specific Gravity: 1.58 (at 20 °C)
• Appearance: Clear, colorless liquid
• Odor: Odorless
• pH (20 °C, 10% w/w solution): 1–2 (typical 1.5)
• Grade: Technical

Common Applications

• Metal Finishing & Rust Removal: Utilized extensively in cleaning, degreasing, and etching processes. It effectively converts iron oxide (rust) into ferric phosphate, preparing metal surfaces for painting or coating (phosphatizing).
• Water Treatment (pH Control): Used to adjust pH levels in mixed-sorbent and recirculating water systems to optimize coagulation and corrosion control.
• Agriculture & Fertilizer: A key reagent in the synthesis of phosphate-based fertilizers and nutrient solutions, aiding in phosphate rock dissolution.
• Chemical Manufacturing: Serves as a reagent for esterification, phosphorylation, and dehydration reactions in industrial chemical synthesis.

Safety Precautions

Handle Phosphoric Acid 75% with appropriate PPE, including chemical-resistant gloves, splash goggles, and a face shield. This product is corrosive to metals and skin. Store in a cool, dry location in compatible containers (HDPE or glass) away from bases and oxidizers. Ensure proper ventilation to minimize vapor buildup.

Transport & Handling: Phosphoric acid solution is classified as UN 1805, Class 8, PG III. Read the Safety Data Sheet (SDS) fully before use. In case of skin or eye contact, rinse immediately with copious water and seek medical attention.

Benefits

Consistent Industrial Strength – 75% concentration ensures reliable performance for heavy-duty descaling and pH adjustment.
Versatile Utility – Suitable for a wide range of applications from wastewater treatment to metal surface prep.
Bulk Availability – Stocked in sizes from 1 quart to 330-gallon totes to support small batch and continuous process operations.

Related Products

• 10% Diluted Acetic Acid Food Grade
• 10% Vinegar - Concentrated Industrial Strength
• 20% Diluted Acetic Acid Food Grade
• Phosphoric Acid 85% ACS Grade