Hydrochloric Acid 37% (HCL 37%) - Technical Grade

Product Overview

Hydrochloric Acid 37% (HCl 37%) - Technical Grade is a concentrated aqueous solution of hydrogen chloride designed for robust industrial use where precise acidity control and strong corrosivity are required. The solution contains approximately 37% w/w HCl, with a molecular weight of 36.46 g/mol and a simple, water-soluble composition that enables rapid pH adjustment, chemical synthesis, and cleaning processes across multiple sectors. This technical grade product is delivered as a clear, colorless liquid with a pungent, irritating odor, and is formulated to meet stringent purity criteria suitable for titration, acid-base reactions, and corrosion-assisted processes in controlled environments.

The product is manufactured to ACS Reagent Grade specifications and USP-NF Monograph standards, ensuring compatibility with laboratory and industrial workflows that demand consistent concentration and trace impurity controls. The density at 25°C is 1.19 g/mL, with a boiling point around 108.6°C and a vapor pressure near 20 mmHg at 20°C, which informs handling, ventilation, and storage considerations in facilities designed to manage volatile acids. By maintaining a tight specification around assay, color, and residue after ignition, this product supports reliable performance in process chemistry, pH adjustment, and surface preparation in metal and food-related applications.

Key Properties

• Product Code: HYDROCHLORIC_ACID_37_HCL_37_TECH
• Chemical Formula: HCl
• Molecular Weight: 36.46 g/mol
• Assay (wt % HCl): min 36, max 38, typical 37
• Color (APHA/Hazen): max 25, typical 10
• Specific Gravity (20°C): min 1.18, max 1.20, typical 1.19
• Residue After Ignition: max 0.05 wt%, typical 0.01
• Chloride (Cl) Content: max 100,000 ppm, typical 20,000
• Nitrate (NO₃⁻): max 30 ppm, typical 10
• Ammonium (NH₄⁺): max 2 ppm, typical 0.5
• Sulfate (SO₄²⁻): max 10 ppm, typical 2
• Phosphate (PO₄³⁻): max 5 ppm, typical 1
• Arsenic (As): max 0.5 ppm, typical 0.1
• Heavy Metals (as Pb): max 0.2 ppm, typical 0.05
• Iron (Fe): max 0.5 ppm, typical 0.05
• Copper (Cu): max 0.5 ppm, typical 0.05
• Manganese (Mn): max 0.5 ppm, typical 0.05
• Nickel (Ni): max 0.2 ppm, typical 0.05
• Lead (Pb): max 0.2 ppm, typical 0.05
• Zinc (Zn): max 0.2 ppm, typical 0.05
• Aluminum (Al): max 0.5 ppm, typical 0.1
• Chromium (Cr): max 0.2 ppm, typical 0.05
• Cobalt (Co): max 0.2 ppm, typical 0.05
• Calcium (Ca): max 5 ppm, typical 1
• Magnesium (Mg): max 5 ppm, typical 1
• Potassium (K): max 50 ppm, typical 5
• Sodium (Na): max 5 ppm, typical 1
• Substances Reducing Permanganate: Passes test
• Sulfurous Acid (H₂SO₃): max 5 ppm, typical 0
• Boiling Point: 108.6°C
• Solubility: Completely soluble in water
• Appearance: Clear, colorless liquid
• Odor: Pungent, irritating odor
• Refractive Index (20°C): 1.334
• Vapor Pressure (20°C): ~20 mmHg
• Storage/Handling Standard: See storage instructions below

Common Applications

• Application Category: pH Adjustment – Used to lower the pH of water in treatment processes, enabling control of scaling, corrosion, and microbial growth in municipal and industrial water systems.
• Application Category: Chemical Synthesis – Serves as a reagent in the production of chlorinated compounds, esters, and other acid-catalyzed reactions in chemical manufacturing.
• Application Category: Metal Cleaning – Effective in removing rust, scale, and oxide layers from metal surfaces prior to plating or finishing operations.
• Application Category: Laboratory Reagent – Widely used in titration, sample digestion, and analytical workflows in research and quality control laboratories.
• Application Category: Food Processing – Utilized in pH control, cleaning, and equipment sanitization in compliant food processing environments.
• Application Category: Etching and Pickling – Employed in metal surface preparation to enhance adhesion and coat acceptance in coatings and galvanization lines.

Safety Precautions

Handling and storage follow stringent hazard controls due to the corrosive and reactive nature of hydrochloric acid. Store in cool, dry, well-ventilated areas away from incompatible materials in containers made of HDPE or glass. Use appropriate ventilation and corrosion-resistant containment to mitigate vapor exposure, and ensure secondary containment for spill scenarios. Always wear chemical-resistant PPE including neoprene or nitrile gloves, chemical splash goggles, face shield where appropriate, and acid-resistant protective clothing. Keep containers tightly closed when not in use and segregate from bases, metals, and organic materials to prevent hazardous reactions. Follow established chemical hygiene plans and local regulatory requirements during handling and transport.

Additional safety considerations include adherence to exposure controls and emergency procedures outlined in the SDS. Implement engineering controls to maintain workplace concentrations below occupational exposure limits, and prepare spill response kits with neutralizing agents compatible with acid spills. In the event of exposure, follow the SDS-guided first aid measures: rinse eyes and skin thoroughly with water, remove contaminated clothing, seek medical attention for skin or eye contact or inhalation exposure, and never induce vomiting in ingestion incidents. Transport information: UN 1789, Hydrochloric acid, Class 8, PG II.

Benefits

✔ Consistent Technical Grade Purity – Meets ACS Reagent Grade and USP-NF Monograph expectations for reliable use in analytical and industrial processes.
✔ Accurate Concentration at Manufacture – Tight assay specification (36–38% w/w) supports precise pH control and stoichiometry in reaction schemes.
✔ Low Impurity Profile – Trace metals and anions maintained within stringent limits to protect process integrity and product quality.
✔ Versatile Solubility – Fully miscible with water, enabling straightforward integration into aqueous workflows and cleaning regimes.