Ethyl acetate (EA, CAS 141-78-6), also known as ethyl ethanoate, is one of the most widely used ester solvents in industry. It is a colorless, volatile liquid with a mild fruity odor, formed by the esterification of ethanol with acetic acid. Because of its balanced polarity, low toxicity and fast evaporation, ethyl acetate is used as a primary solvent or co-solvent in countless industrial formulations. This article explains what it is, its specifications, its main applications, and how to handle it safely.
What Is Ethyl Acetate?
Ethyl acetate is an ester with the molecular formula C4H8O2 and a molecular weight of 88.11 g/mol. Its structure, CH3COOCH2CH3, consists of an acetate group bonded to an ethyl group. It is a colorless, transparent liquid with a pleasant, fruity odor reminiscent of pears. It is slightly soluble in water, fully miscible with most organic solvents, and evaporates quickly at room temperature. These properties make it an excellent solvent for nitrocellulose, acrylic resins, oils and many other film-forming materials.
Specifications of Industrial Grade Ethyl Acetate
| Item | Typical Value |
|---|---|
| Product name | Ethyl acetate (EA) |
| CAS number | 141-78-6 |
| Molecular formula | C4H8O2 |
| Purity | 99.5% or higher |
| Appearance | Colorless transparent liquid |
| Density (20 °C) | About 0.90 g/cm3 |
| Boiling point | About 77 °C |
| Flash point | About -4 °C |
| Solubility in water | Slightly soluble |
Main Applications of Ethyl Acetate
Ethyl acetate is an important industrial solvent used across many sectors:
Coatings: As a solvent for nitrocellulose lacquer, acrylic lacquer and polyurethane systems, it evaporates quickly and forms a uniform film, improving application efficiency and surface quality.
Printing inks: Used in gravure and flexographic inks to dissolve resins and pigments, ensuring print clarity, adhesion and drying speed.
Adhesives: Used as a fast-drying solvent in adhesives, sealants and nail polish formulations to promote rapid curing and good flow.
Electronics cleaning: Used to clean precision circuit boards and components, removing grease and flux residue without leaving streaks.
Food and flavoring: As a permitted food additive in many regions, ethyl acetate is used as a flavoring agent that simulates fruity aromas such as pineapple and pear in candies, beverages and ice cream, and as an extraction solvent for flavor substances such as caffeine and vanilla components.
Pharmaceuticals: It is used as a process solvent in the synthesis and purification of active pharmaceutical ingredients.
How to Select the Right Grade
Ethyl acetate is supplied in several grades. Industrial grade, with a minimum purity of 99.5%, is suitable for coatings, inks, adhesives and cleaning applications. Food and pharmaceutical grades meet stricter purity, odor and impurity limits and are required for applications involving food contact or drug production. Buyers should obtain a certificate of analysis and verify key parameters such as purity, water content, acidity, color and distillation range against the applicable standard, such as GB/T 3728 for industrial ethyl acetate, before accepting a batch.
Safety, Storage and Transport Considerations
Ethyl acetate is a highly flammable liquid with a flash point of about -4 °C. Vapors can form explosive mixtures with air, so the substance must be stored away from ignition sources, open flames and strong oxidizers, in a cool, well-ventilated area with proper grounding during transfer. Inhalation of high vapor concentrations can cause irritation of the eyes and respiratory tract, headache and drowsiness, so workplaces should maintain adequate ventilation. Appropriate personal protective equipment includes safety goggles, chemical-resistant gloves and protective clothing. For transport, ethyl acetate is regulated as a flammable liquid (Class 3) and must be carried in approved packaging with the correct hazard labels.
Frequently Asked Questions
What is ethyl acetate used for? Ethyl acetate is used as a solvent in coatings, printing inks, adhesives, electronics cleaning and pharmaceutical processing, and as a flavoring and extraction agent in the food industry.
Is ethyl acetate the same as ethyl ethanoate? Yes. Ethyl ethanoate is the systematic name for ethyl acetate, which has the CAS number 141-78-6 and the formula C4H8O2.
Is ethyl acetate safe for food use? Food-grade ethyl acetate is permitted as a flavoring agent in many countries and is used in small quantities. Industrial grade, however, is not intended for food contact.
Why is ethyl acetate used in nail polish remover? Its fast evaporation and strong solvency for film-forming polymers make it effective at dissolving nail coatings quickly while leaving a clean surface.
How should ethyl acetate be stored? Store in a cool, well-ventilated area away from heat, sparks and oxidizers, in tightly sealed containers, with static grounding and fire-fighting equipment nearby.
Is ethyl acetate flammable? Yes, it is highly flammable with a flash point of about -4 °C, and its vapors can form explosive mixtures with air, so strict fire precautions are required.
