Butyl Glycol Overview: Properties, Uses, and Industrial Applications

June 22, 2026

What is Butyl Glycol?

Butyl glycol (also known as ethylene glycol monobutyl ether, 2-butoxyethanol, or BG) is a clear, colorless, and oily liquid with a mild, characteristic ether-like odor. Chemically, it belongs to the glycol ether family, bearing the molecular formula $C_6H_{14}O_2$ ( $CH_3(CH_2)_3OCH_2CH_2OH$ ).

What makes butyl glycol an exceptional industrial chemical is its bi-functional molecular structure. It contains both an ether linkage (hydrophobic/lipophilic) and a hydroxyl group (hydrophilic) within a single molecule. This unique configuration gives it an outstanding balance of surfactant-like properties, high boiling point ( $171^\circ\text{C}$ ), low volatility, and excellent coupling efficiency. It acts as a bridge to miscible water and hydrophobic organic solvents, making it one of the most versatile co-solvents in modern chemical manufacturing.

Key Technical Specifications (Typical Analysis)

Parameter	Specification	Test Method
Purity	$\ge 99.5\%$	Gas Chromatography
Water Content	$\le 0.1\%$	Karl Fischer
Density (@ 20°C)	$0.900 - 0.904 \text{ g/cm}^3$	ASTM D4052
Boiling Point	$171.2^\circ\text{C}$	ASTM D1078
Acidity ( as Acetic Acid)	$\le 0.01\%$	ASTM D1613

What is Butyl Glycol Used For?

Thanks to its powerful solvency and coupling capability, butyl glycol is widely consumed across various heavy industries. Below are the primary commercial applications where butyl glycol plays a critical role:

Paints, Coatings, and Surface Refinishing

In the coatings industry, butyl glycol serves as a crucial co-solvent and coalescing aid, especially for waterborne systems and baking enamels.

Flow and Leveling: It regulates the evaporation rate, preventing surface defects such as blistering, pinholes, and orange peel during the drying process.
Film Formation: For water-based latex coatings, it lowers the Minimum Film Forming Temperature (MFFT), ensuring a smooth, continuous, and high-gloss protective barrier.
Resin Compatibility: It efficiently dissolves standard coating resins, including alkyds, acrylics, epoxies, and nitrocellulose.

Printing Inks and Silk-Screening

Butyl glycol is an essential formulation component for solvent-based and water-soluble printing inks.

Because of its high boiling point and slow evaporation rate, it prevents the ink from drying prematurely on the printing rollers or silk screens, reducing downtime for cleaning and enhancing printing precision in high-speed production lines.

Industrial and Household Cleansers

As a heavy-duty degreasing agent, butyl glycol is widely formulated into hard-surface cleaners, glass cleaners, and industrial metal degreasers.

Soil Removal: Its amphiphilic nature allows it to penetrate, dissolve, and lift stubborn hydrophobic soils, such as oils, greases, waxes, and tars, transferring them into an aqueous solution without leaving oily residues.

Textile Auxiliaries and Leather Processing

In textile chemical operations, butyl glycol is utilized as a penetrant and leveling agent in dyeing and printing formulas.

It ensures deep dye penetration into synthetic and natural fibers, promoting uniform color distribution. It also functions as a coupling solvent in leather finishes to achieve an even and durable protective coating.

Oilfield and Oil Spill Dispersants

In upstream oil and gas operations, butyl glycol is a vital component of fracturing fluids, drilling muds, and oil slick dispersants.

Its surfactant-like behavior helps reduce interfacial tension and stabilize formulations under high-temperature and high-pressure (HTHP) reservoir conditions, preventing wax precipitation.

Regulatory Status, Safe Handling, and Global Logistics

Due to its classification under GHS standards, international procurement teams must adhere to strict environmental and regulatory protocols when importing butyl glycol.

Regulatory Compliance: High-quality commercial batches must fully comply with EU REACH regulations, ensuring strict limits on volatile organic compounds (VOCs) where applicable.
Storage and Handling: It is classified as a Class 1 Combatable Liquid (Flash Point: $67^\circ\text{C}$ ). It must be stored in tightly sealed, carbon steel or stainless steel drums/ISO tanks, isolated from direct sunlight, moisture, and strong oxidizing agents to prevent peroxide formation.