What Is 2-Ethylhexyl acrylate

Content on WhatAnswers is provided "as is" for informational purposes. While we strive for accuracy, we make no guarantees. Content is AI-assisted and should not be used as professional advice.

Last updated: April 15, 2026

Quick Answer: 2-Ethylhexyl acrylate (2-EHA) is an organic ester with the chemical formula C11H20O2, widely used in polymer and coating industries. It was first synthesized in the 1940s and is a key monomer in producing flexible, weather-resistant acrylic polymers.

Key Facts

2-Ethylhexyl acrylate has the molecular formula C11H20O2 and a molecular weight of 184.27 g/mol
It is a colorless to pale yellow liquid with a boiling point of 211–214°C
Over 100,000 metric tons are produced globally each year, primarily in Asia and Europe
It is classified as harmful if inhaled or absorbed through skin (H332, H312 EU CLP)
2-EHA was first industrially produced in the late 1940s by German chemical firms

Overview

2-Ethylhexyl acrylate (2-EHA) is a clear, colorless to slightly yellow liquid used primarily as a monomer in the production of acrylic polymers. Its chemical structure combines the acrylate group with a branched 2-ethylhexyl chain, giving it unique flexibility and hydrophobic properties.

Widely used in adhesives, coatings, and sealants, 2-EHA enhances durability and resistance to environmental stress. Its low glass transition temperature makes it ideal for creating soft, rubbery polymer films in pressure-sensitive applications.

Chemical formula: C11H20O2, with a molecular weight of 184.27 g/mol, allowing for precise industrial formulation
Boiling point: Ranges between 211–214°C, making it suitable for high-temperature processing without decomposition
Solubility: Slightly soluble in water (0.4 g/L at 20°C), but highly miscible with most organic solvents
Density: Measures 0.897 g/cm³ at 25°C, influencing its handling and storage requirements
Synthetic origin: Derived from the esterification of acrylic acid with 2-ethylhexanol, a process optimized since the 1950s

How It Works

2-Ethylhexyl acrylate functions as a reactive monomer in free-radical polymerization, forming long-chain polymers with tailored mechanical properties. Its structure enables cross-linking with other monomers to achieve desired elasticity and adhesion.

Monomer: A molecule that binds chemically to form polymers; 2-EHA polymerizes to create soft, flexible acrylic resins used in adhesives
Free-radical polymerization: Initiated by peroxides or UV light, this process links 2-EHA units into chains at rates up to 95% conversion efficiency
Hydrophobicity: The 2-ethylhexyl group repels water, granting coatings resistance to moisture and weathering over decades
Low Tg (glass transition temperature): At –50°C, it ensures polymers remain flexible even in freezing conditions
Copolymerization: Often combined with methyl methacrylate or vinyl acetate to balance hardness and elasticity in final products
Adhesion promoter: Enhances bonding to low-energy surfaces like polyethylene, critical in packaging and tape manufacturing

Comparison at a Glance

Comparing 2-Ethylhexyl acrylate with similar monomers highlights its unique balance of flexibility and reactivity.

Monomer	Chemical Formula	Boiling Point (°C)	Primary Use	Flexibility Index
2-Ethylhexyl acrylate	C11H20O2	211–214	Flexible adhesives, coatings	High
Butyl acrylate	C7H12O2	148–150	General-purpose acrylics	Medium
Methyl methacrylate	C5H8O2	100–102	Rigid plastics, plexiglass	Low
Ethyl acrylate	C5H8O2	99–101	Textile finishes, inks	Medium
2-Ethylhexyl methacrylate	C12H22O2	230–232	High-performance coatings	High

The data shows that 2-EHA offers superior flexibility and higher boiling point than most common acrylates, making it ideal for outdoor and industrial applications. While more expensive than butyl acrylate, its performance in extreme conditions justifies the cost in critical applications like automotive sealants and solar panel encapsulation.

Why It Matters

2-Ethylhexyl acrylate plays a vital role in modern materials science, enabling the development of high-performance, durable products across multiple industries. Its unique properties support innovations in sustainable packaging, renewable energy, and advanced medical devices.

Adhesive technology: Used in 90% of pressure-sensitive tapes for electronics and medical applications due to its reliable peel strength
Automotive coatings: Enhances paint durability, resisting chipping and UV degradation for over 10 years in field tests
Solar panel encapsulation: Protects photovoltaic cells from moisture, increasing lifespan to 25+ years
Medical tapes: Provides gentle yet secure adhesion, minimizing skin irritation in transdermal patches
Environmental impact: Classified as readily biodegradable under OECD 301B standards, reducing ecological persistence
Global supply: Major producers include BASF, Dow, and Mitsubishi Chemical, with Asia-Pacific accounting for 45% of production

As demand for resilient, eco-friendly materials grows, 2-Ethylhexyl acrylate remains a cornerstone of polymer innovation, bridging performance and sustainability in next-generation products.