Propylene Glycol 50% – USP Grade (C3H8O2)

Product Overview

Propylene Glycol 50% – USP Grade is a precise aqueous solution consisting of 50% Propylene Glycol (C3H8O2) and 50% deionized water. Manufactured using USP-grade feedstock, this colorless, odorless solution eliminates the need for on-site dilution, providing a consistent concentration for critical applications. Also known as Propane-1,2-diol or MPG, it functions as a versatile solvent, humectant, and heat transfer fluid across pharmaceutical, food processing, and industrial sectors.

This 50% formulation is designed for operations requiring specific viscosity and freeze-point depression characteristics. It offers excellent stability and compatibility with standard industrial equipment. While the base material meets strict USP-NF Monograph requirements for purity—including low limits for heavy metals, chlorides, and aldehydes—this solution is optimized for ease of use in chillers, manufacturing pipelines, and formulation processing where a pre-diluted glycol is required.

Key Properties

• Product Concentration: 50% Propylene Glycol / 50% Water
• Chemical Formula: C₃H₈O₂ (Active Ingredient)
• Grade: USP (Feedstock)
• Molecular Weight: 76.09 g/mol
• Boiling Point: Approx. 106°C (Solution)
• Specific Gravity (20°C): ~1.04 (Solution Typical)
• Residue on Ignition: ≤0.005 wt%
• Chloride (Cl⁻): ≤10 ppm
• Heavy Metals (as Pb): ≤5 ppm
• Iron (Fe): ≤0.2 ppm
• Acidity (Meq/g): ≤0.1

Common Applications

• Heat Transfer Fluid: Industrial – Used in chillers and glycol loops where freeze protection and burst protection are required without the toxicity of ethylene glycol.
• Humectant: Manufacturing – Acts as a moisture-retaining agent in various processing formulations to maintain product stability and texture.
• Solvent: Processing – Effective solvent for fragrances, flavors, and emulsification in industrial applications requiring USP-grade purity.
• Equipment Storage: Preservation – Used to store spraying equipment and lines to prevent freezing and seal degradation during downtime.
• Carrier Fluid: Formulation – Serves as a stable carrier for sensitive active ingredients in non-medical liquid formulations.

Safety Precautions

Store Propylene Glycol 50% in a cool, well-ventilated area away from direct sunlight. Recommended storage containers include HDPE, stainless steel, or glass to maintain solution purity. Keep containers tightly closed when not in use to prevent contamination. While Propylene Glycol is generally considered low-toxicity, standard industrial hygiene practices should be observed.

Wear appropriate Personal Protective Equipment (PPE), including safety glasses and gloves, during handling to prevent skin or eye irritation. In the event of a spill, contain the liquid and dispose of it according to local, state, and federal regulations. Refer to the Safety Data Sheet (SDS) for detailed handling, storage, and emergency procedures.

Benefits

Ready-to-Use Concentration – Pre-mixed 50% solution ensures accuracy and saves mixing time.
USP-Grade Feedstock – Manufactured from high-purity inputs with low impurity profiles.
Versatile Utility – Functions effectively as a solvent, antifreeze, and humectant.
Non-Toxic Profile – Safer alternative to ethylene glycol for applications involving potential incidental contact.

Related Products

• 100% Ethylene Glycol Inhibited
• 100% Propylene Glycol Inhibited
• 30% Propylene Glycol Inhibited
• Propylene Glycol 40% – Technical Grade