50% Propylene Glycol Technical Grade

Product Overview

50% Propylene Glycol Technical Grade is a clear, colorless liquid designed for use as a versatile solvent and humectant across a broad range of industrial formulations. It is a diol with the chemical formula C₃H₈O₂, featuring low toxicity and hygroscopic properties that support stable moisture retention and consistent performance in varied environments. The product meets Technical Grade specifications and USP-NF monograph alignment, with a typical assay of 50 wt% for precise formulation control. Its relatively low vapor pressure, noted by a 20°C vapor pressure near 0.1 mmHg, supports safe handling and reduced VOC concerns in many process applications. The material demonstrates good water miscibility and compatibility with numerous organic solvents, enabling it to function effectively as a solvent, carrier, or humectant in both analytical and manufacturing settings.

This propylene glycol solution is produced with rigorous quality control and characterization to ensure batch-to-batch consistency. The specification set includes tightly controlled heavy metals and chloride impurity limits, alongside pH, water content, and residual oxidizable substances to support formulation reliability. With a density around 1.036 g/mL at 25°C and a refractive index of approximately 1.431, formulators can predict flow, solubility, and optical properties with confidence. The material is stable under recommended storage conditions and features a broad compatibility profile for automotive, coatings, cosmetic, and laboratory use cases. Its clear, odoraceous profile (slightly sweet odor) assists in handling across diverse facilities while meeting applicable regulatory expectations.

Key Properties

• CAS: 57-55-6
• Appearance: Clear, colorless liquid
• Odor: Slightly sweet odor
• Molecular Formula: C₃H₈O₂
• Molecular Weight: 76.09 g/mol
• Boiling Point: 188.2 °C
• Specific Gravity (20°C): 1.033 – 1.047 (typical 1.04)
• Density (25°C): 1.036 g/mL
• Vapor Pressure (20°C): 0.1 mmHg
• Refractive Index (20°C): 1.431
• Viscosity (25°C): 50 cP
• pH (1% w/v or distilled water emulsion): 6 – 8 (typical 7)
• Chloride (Cl⁻, as Cl): max 100 ppm (typical 20 ppm)
• Heavy Metals (as Pb, ICP-OES): max 0.5 ppm (typical 0.05 ppm)
• Arsenic (As, ICP-MS): max 0.01 ppm (typical 0.001 ppm)
• Iron (Fe, ICP-OES): max 0.5 ppm (typical 0.05 ppm)
• Copper (Cu, ICP-OES): max 0.5 ppm (typical 0.05 ppm)
• Manganese (Mn, ICP-OES): max 0.5 ppm (typical 0.05 ppm)
• Nickel (Ni, ICP-OES): max 0.5 ppm (typical 0.05 ppm)
• Lead (Pb, ICP-OES): max 0.5 ppm (typical 0.05 ppm)
• Zinc (Zn, ICP-OES): max 1 ppm (typical 0.1 ppm)
• Aluminum (Al, ICP-OES): max 1 ppm (typical 0.1 ppm)
• Chromium (Cr, ICP-OES): max 0.5 ppm (typical 0.05 ppm)
• Cobalt (Co, ICP-OES): max 0.2 ppm (typical 0.02 ppm)
• Calcium (Ca, ICP-OES): max 10 ppm (typical 1 ppm)
• Magnesium (Mg, ICP-OES): max 10 ppm (typical 1 ppm)
• Potassium (K, ICP-OES): max 5 ppm (typical 1 ppm)
• Sodium (Na, ICP-OES): max 5 ppm (typical 1 ppm)
• Water Content: max 0.5% (typical 0.2%)
• Acidity (Meq/100 g): max 0.5 (typical 0.1)
• Aldehydes (ppm): max 20 (typical 5)
• Residual Substances Detectable by Permanganate: Passes test
• Free Alkali (NaOH wt%): max 0.2 (typical 0.05)

Common Applications

• HPLC Mobile Phase: Used as a mobile phase component in reversed-phase HPLC for separating organic compounds, providing consistent solvency and peak shape in analytical workflows.
• Humectant in Cosmetics: Acts as a humectant to retain moisture in cosmetic formulations, contributing to stability and skin feel without introducing strong odors or color.
• Antifreeze Agent: Serves as a non-toxic antifreeze component in automotive cooling systems, offering freeze protection with favorable heat transfer properties.
• Solvent for Paints: Functions as a solvent in paints and coatings to improve flow, leveling, and film formation in industrial formulations.
• Carrier for Flavors: Used as a carrier for flavors and fragrances in food and beverage applications, aiding solubility and uniform distribution.

Safety Precautions

Handle the product in a well-ventilated area and store in a cool, dry place away from direct sunlight. Use materials compatible with polyethylene or stainless steel for storage and handling. Avoid contact with strong oxidizing agents. Wear appropriate PPE, including gloves and goggles, and ensure adequate ventilation during transfer to minimize inhalation exposure.

In case of exposure, rinse eyes with plenty of water for several minutes and remove contact lenses if present. If skin contact occurs, wash with soap and water and seek medical advice if irritation develops. If inhaled, move to fresh air and maintain comfortable breathing. If swallowed, rinse mouth and do not induce vomiting; seek medical attention if symptoms occur. The product is not classified as hazardous for transport, but always consult the SDS and local regulations for handling procedures and emergency response guidelines.

Benefits

✔ Technical Grade with USP-NF Alignment – Provides reliable quality suitable for analytical and manufacturing applications with tight impurity controls and validated test methods.
✔ Broad Compatibility – Compatible with water and a wide range of organic solvents, enabling versatile solvent systems and humectant formulations.
✔ Rigorous Impurity Control – Low heavy metals, chloride, and trace metals support compliance with industry standards and regulatory expectations.
✔ Storage Stability – Stable under recommended storage conditions with a defined shelf life of 24 months from manufacture date when stored properly.