Phosphoric Acid 85% ACS Grade

Product Overview

Phosphoric Acid 85% ACS Grade is a clear, colorless liquid that provides high purity orthophosphoric acid (H₃PO₄) essential for applications demanding precise chemical composition and minimal impurities. The ACS Grade designation indicates alignment with authoritative monographs and stringent impurity limits, ensuring suitability for laboratory, pharmaceutical, and industrial use. This product is supplied with a targeted assay in the 85.0–85.9 wt% range, validated by titration against standardized NaOH per ACS/USP monographs, and features low residue after evaporation to support high-purity processing. Its specification set includes low color (APHA ≤6, typically ~3) and strict heavy metal controls, supporting reproducible results across critical applications.

This ACS Grade phosphoric acid is widely used in pH adjustment, fertilizer production, and as a chemical reagent in synthesis workflows. It exhibits controlled density and purity to maintain consistent dosing in water treatment, metal cleaning, and process acidification. The product is designed for compatibility with HDPE or glass containers, with storage guidance emphasizing protection from moisture and light to preserve integrity. Compliance with ACS Reagent Grade and USP-NF Monograph standards reinforces its reliability for industrial and institutional users requiring traceable quality and appropriate documentation, including Certificates of Analysis and SDS documentation.

Key Properties

• Product Code: PHOSPHORIC_ACID_85_ACS_GRADE
• Name: Phosphoric Acid 85% ACS Grade
• Appearance: Clear, colorless liquid
• Odor: Odorless
• Chemical Formula: H₃PO₄
• Molecular Weight: 98.00 g/mol
• Boiling Point: 158 °C
• Freezing Point: 21 °C
• Density (25°C): 1.685 g/mL
• Specific Gravity (20°C): 1.689 (typical)
• Assay (wt%): 85.5% (typical); min 85.0%, max 85.9% (test method: Titration with standardized NaOH per ACS/USP monographs)
• Residue After Ignition: 0.05% (typical); max 0.1% (test method: Ignition to constant weight at 650°C)
• Chloride: ≤100 ppm (typical ~20 ppm; test method: IC/ICP-OES)
• Nitrate (NO₃⁻): ≤50 ppm (typical ~10 ppm; test method: IC)
• Phosphate (PO₄³⁻): ≤20 ppm (typical ~5 ppm; test method: IC)
• Water Content (H₂O): ≤0.15% (typical ~0.05%; test method: Karl Fischer)
• Arsenic (As): ≤0.01 ppm (typical ~0.003 ppm; test method: ICP-MS)
• Heavy Metals (Pb): ≤0.5 ppm (typical ~0.1 ppm; test method: ICP-MS)
• Iron (Fe): ≤0.5 ppm (typical ~0.1 ppm; test method: ICP-OES)
• Copper (Cu): ≤0.2 ppm (typical ~0.05 ppm; test method: ICP-OES)
• Zinc (Zn): ≤1 ppm (typical ~0.2 ppm; test method: ICP-OES)
• Chromium (Cr): ≤0.5 ppm (typical ~0.1 ppm; test method: ICP-OES)
• Sulfate (SO₄²⁻): ≤50 ppm (typical ~10 ppm; test method: IC/ICP-OES)
• Aluminum (Al): ≤0.5 ppm (typical ~0.1 ppm; test method: ICP-OES)
• Magnesium (Mg): ≤100 ppm (typical ~20 ppm; test method: ICP-OES)
• Calcium (Ca): ≤200 ppm (typical ~40 ppm; test method: ICP-OES)
• Potassium (K): ≤50 ppm (typical ~10 ppm; test method: ICP-OES)
• Sodium (Na): ≤50 ppm (typical ~10 ppm; test method: ICP-OES)
• Critical Notes: Substances reducing permanganate passes KMnO₄ time test; meets color and darkened H₂SO₄ criteria for purity

Common Applications

• Application Category: pH Adjustment – Used to precisely set and maintain pH in water treatment, industrial processes, and chemical manufacturing, enabling controlled acidification and corrosion management.
• Application Category: Fertilizer Production – Key nutrient acidity component for phosphate fertilizer synthesis, influencing solubility and availability in soil amendments.
• Application Category: Food Additive – Acidity regulator and sequestering agent in processed foods, contributing to texture and preservation while meeting regulatory purity standards.
• Application Category: Chemical Synthesis – Reagent in pharmaceutical and specialty chemical syntheses, providing reliable acidity and reaction control with minimal impurity interference.
• Application Category: Cleaning Agent – Effective for rust and scale removal on metal surfaces in industrial cleaning, electrolytic pretreatment, and surface finishing processes.

Safety Precautions

Handling and storage should follow strict chemical hygiene practices. Store in a cool, dry place away from incompatible materials, and use containers made of HDPE or glass to minimize container interactions. Protect from moisture and light exposure, and ensure adequate ventilation in storage and process areas. Wear appropriate PPE, including chemical-resistant gloves, splash goggles, and protective clothing, with eye wash and emergency showers readily accessible. Follow the SDS and ensure secondary containment where applicable to prevent spills and exposure.

Additional safety considerations include monitoring for corrosive exposure and metal compatibility, as well as implementing emergency procedures for skin or eye contact, inhalation, or ingestion. The product is classified with GHS: Skin Corr. 1A, Eye Dam. 1, and Metal Corr. 1; emergency response should follow standard protocols for caustic acids, including immediate wound irrigation and medical evaluation. Transport is UN 1805, Phosphoric acid, Class 8, PG II, requiring appropriate labeling and handling during transit.

Benefits

✔ High Purity ACS Grade – Meets ACS and USP-NF monograph expectations with low trace impurities, ensuring reliable analytical and process performance.
✔ Stable, Reproducible Density and Purity – Tight specification range supports consistent dosing and formulation control in manufacturing and laboratory settings.