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ETHYLHEXYL ACRYLATE.

Questionable CAS 103-11-7 / BINDING

Ethylhexyl Acrylate (EHA) is a monomer foundational to the synthesis of various polymers and copolymers, extensively utilized across industrial and cosmetic sectors. While not an active ingredient for direct skin benefit, it is typically found as a trace residual within acrylate polymers in skincare formulations, contributing to film-forming and durability.

Summary

Polymer Precursor Film-forming Agent (indirect, via polymers)

Science

Mechanism of Action

Ethylhexyl Acrylate functions as a foundational monomer, forming polymers and copolymers that contribute to product characteristics such as film-forming capabilities, enhanced adhesion, flexibility, and durability. It does not possess a direct active mechanism beneficial to the skin when present in formulations.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Ethylhexyl Acrylate is a combustible liquid that is stable under normal conditions but can spontaneously polymerize when exposed to elevated temperatures, light, or contamination. To maintain stability for up to one year, it must be stored below 35°C in the presence of air (oxygen) to activate its stabilizer, typically Monomethyl Ether of Hydroquinone (MEHQ). Stainless steel or aluminum storage vessels are recommended to prevent contamination.

Conflicts

  • Oxidizing agents
  • Heat
  • Light
  • Contamination (leads to polymerization)
  • Inert gases (oxygen is crucial for stabilizer activation)

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
0.02%
Sensitization risk High

The Cosmetic Ingredient Review (CIR) Expert Panel has not directly evaluated Ethylhexyl Acrylate as a standalone cosmetic ingredient. However, they have deemed acrylate copolymers, which may contain residual EHA, safe for cosmetic use when formulated to prevent irritation. Residual monomeric EHA in polymer dispersions is typically maintained below 0.02%. It was previously classified as a Group 2B carcinogen by the International Agency for Research on Cancer (IARC) and listed under California Proposition 65 as 'Known to cause cancer', though IARC later reclassified it to Group 3 ('not classifiable as to its carcinogenicity to humans'). Animal studies indicating tumor formation occurred at high, irritating concentrations, suggesting irritation rather than direct carcinogenicity at relevant exposure levels.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
No Sensitive
Irritancy High
Comedogenicity Unknown

Our Assessment

Verdict

Questionable

Ethylhexyl Acrylate is a monomer primarily used to form polymers that enhance product properties; it offers no direct skin benefits and, as a monomer, carries a high irritancy potential and a complex safety history, making its direct presence in skincare questionable.

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