1-Ethoxy-2-propanol (PGEE): A Versatile Industrial Glycol Ether Solvent

1-Ethoxy-2-propanol—also known as Propylene Glycol Monoethyl Ether (PGEE), with CAS No. 1569-02-4—is a key glycol ether solvent used across many industrial sectors. Its molecular formula is C₅H₁₂O₂, and it has a molecular weight of 104.15 g/mol. It’s a colorless, hygroscopic liquid with a mild, ether-like smell, and it mixes completely with water.

This compound has excellent solvent properties, with a boiling point around 132°C and a melting point of -100°C. At 25°C, its density ranges from 0.895 to 0.9028 g/mL, and its refractive index is between 1.405 and 1.408. It’s a flammable liquid, with a flash point of 38–43°C and an autoignition temperature of 255°C. Its explosive limits in air are 1.3% to 12% by volume. At 25°C, it has a vapor pressure of 4.2 mmHg and a viscosity of 1.88 mPa·s.

1-Ethoxy-2-propanol works well as a solvent for many resins, including epoxies, acrylics, alkyds, polyesters, nitrocellulose, and polyurethanes. In the surface coating and printing industries, it helps control flow, leveling, and coalescence—key properties for high-quality finishes. Beyond coatings, it’s used as a cleaning agent, grease and paint remover, fuel anti-freeze, extractant, dispersant, and diluent. It also acts as an intermediate in making agrochemicals and de-icing/anti-icing products.

Classified as a GHS Category 3 flammable liquid, 1-Ethoxy-2-propanol has hazard statements H226 (flammable liquid and vapor) and H336 (may cause drowsiness or dizziness). It’s a mild irritant to the eyes and respiratory tract; inhaling high concentrations can depress the central nervous system. Proper handling requires good ventilation, protective gloves, safety glasses, and storage away from strong oxidants in a fireproof area. It can form explosive peroxides when exposed to air, so storage needs extra care.

With annual production in the thousands of tons, this compound remains a valuable industrial solvent, with wide-ranging uses across multiple fields.