Propylene Glycol: Applications in Energy, Heating & Industrial Use

Propylene glycol (CAS 57-55-6), also known as 1,2-propanediol, is a synthetic liquid substance that absorbs water and is used across a remarkable range of industries. With the molecular formula C₃H₈O₂, it is one of the most versatile chemical compounds in commercial use today.

## What Is Propylene Glycol?

Propylene glycol is a colorless, odorless, viscous liquid that is miscible with water, acetone, and chloroform. It is produced from propylene oxide and is considered safe for use in food, pharmaceutical, and cosmetic applications by regulatory agencies worldwide.

## Key Applications of Propylene Glycol

**Heating & HVAC Systems**
One of propylene glycol's most significant industrial applications is as an antifreeze and heat transfer fluid. Unlike ethylene glycol, propylene glycol is considered non-toxic, making it the preferred choice for systems where incidental human or animal contact is possible — including food processing facilities, breweries, and residential heating systems.

**Food & Beverage**
Food-grade propylene glycol is approved as a food additive (E1520) and is used as a humectant, solvent, and preservative. It is found in baked goods, salad dressings, flavorings, and food colorings.

**Pharmaceuticals**
USP-grade propylene glycol is used as a solvent and excipient in oral, injectable, and topical pharmaceutical formulations. It helps dissolve active ingredients that are poorly water-soluble.

**Cosmetics & Personal Care**
Propylene glycol is found in a wide range of personal care products including moisturizers, shampoos, deodorants, and makeup. It functions as a humectant, keeping skin hydrated by attracting moisture.

**Industrial Applications**
Industrial-grade propylene glycol is used in the production of unsaturated polyester resins, which are used in fiberglass, boat hulls, and construction materials.

## Available Grades

- Industrial Grade
- USP/EP Grade
- Food Grade (FCC)

## Source Propylene Glycol Through OpenFormula

OpenFormula supplies propylene glycol in all grades and packaging options from drums to bulk tanker quantities. Request a quote today.