Phosphoric Acid 85% ACS Grade

Product Overview

Phosphoric Acid 85% ACS Grade (Orthophosphoric Acid) is a clear, colorless liquid formulation of H3PO4 designed for critical applications requiring strict purity limits. As an ACS Reagent Grade chemical, this product aligns with authoritative monographs, ensuring low trace metal impurities and consistent assay levels between 85.0% and 85.9%. It is the standard choice for laboratory analysis, pharmaceutical synthesis intermediates, and high-precision industrial processing.

This high-purity acid serves as a vital component in pH adjustment, metal passivation, and chemical manufacturing. Unlike technical grades, ACS Grade Phosphoric Acid ensures reproducible results by minimizing contaminants like iron, heavy metals, and chloride. It is compatible with HDPE and glass storage and is widely used for rust removal, surface preparation, and as a chemical reagent. We supply this product in a wide range of pack sizes, from lab-scale quantities to bulk totes, ensuring scalability for your operation.

Key Properties

• Product Name: Phosphoric Acid 85% ACS Grade
• Synonyms: Orthophosphoric Acid, H3PO4
• CAS Number: 7664-38-2
• Appearance: Clear, colorless liquid
• Assay: 85.0% – 85.9% (Titration)
• Grade: ACS Reagent Grade
• Formula: H3PO4
• Molecular Weight: 98.00 g/mol
• Density (25°C): 1.685 g/mL
• Boiling Point: 158 °C
• Heavy Metals (as Pb): ≤0.5 ppm
• Iron (Fe): ≤0.5 ppm
• Chloride: ≤100 ppm

Common Applications

• Laboratory Reagent: Used as a high-purity analytical reagent in chromatography and titration workflows.
• pH Adjustment: Precise pH control in water treatment and industrial chemical processing.
• Metal Finishing: Highly effective for rust removal, passivation of stainless steel, and phosphate conversion coating.
• Chemical Synthesis: Acts as a catalyst or reagent in the production of phosphates, activated carbon, and specialty chemicals.
• Equipment Cleaning: Removes mineral deposits and scale from industrial machinery and heat exchangers.

Safety & Handling

Phosphoric Acid 85% is corrosive and must be handled with appropriate personal protective equipment (PPE), including chemical-resistant gloves, splash goggles, and face shields. It is classified as Skin Corr. 1B and Metal Corr. 1. Ensure adequate ventilation during use to avoid inhalation of mists. Store in a cool, dry area in corrosion-resistant containers (HDPE or glass) away from alkalis and reactive metals. Refer to the Safety Data Sheet (SDS) for detailed emergency and disposal information.

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