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Moumoujus

2-HYDROXYETHYL ACRYLATE.

Optional CAS 818-61-1 / FILM FORMING

A versatile monomer that polymerizes into film-forming polymers for enhanced texture and moisture retention in skincare formulations. Functions as both a building block for high-molecular-weight copolymers and a cross-linking agent in hydrogel systems. While effective for viscosity control and barrier formation, requires careful formulation to minimize sensitization potential.

Summary

viscosity controlling film forming polymer precursor cross-linking agent

Science

Mechanism of Action

Creates continuous protective films on skin surface while serving as a monomer for polymer synthesis, particularly in hydroxyethyl acrylate/sodium acryloyldimethyl taurate copolymers. Acts as a cross-linking agent in hydrogel matrices to enhance water retention and improve mechanical strength of formulations.

Research

Clinical Evidence

High confidence
Effective range 2–3%
Optimal

3%

Key findings

  1. 01 Patch testing revealed sensitization rates of 1.5% to 4.3% in eczema patients across multiple geographic regions
  2. 02 CIR Expert Panel confirmed safety of polymerized forms in leave-on products when residual monomer levels remain minimal

Transparency

Dusting Analysis

Not commonly dusted

Typically used as a functional polymer precursor rather than a marketing ingredient, with concentrations limited by regulatory safety thresholds

The Formula

Formulation

Solubility
Water
Optimal pH 3 – 11
0 7 14

Stability

Requires oxygen presence and stabilizers like MEHQ to prevent premature polymerization. Undergoes rapid hydrolysis above pH 11 and exhibits exothermic polymerization when heated or contaminated.

Synergies

  • Sodium acryloyldimethyl taurate for copolymer formation
  • Hydrogel matrices for enhanced water retention

Conflicts

  • Inert gas atmospheres
  • Strong oxidizing agents
  • Free-radical initiators
  • Cellulose-based absorbents

Safety

Safety Profile

CIR Status
Safe as used
Max tested
3%
Sensitization risk Moderate

Safety depends on complete polymerization and minimal residual monomer content. Monomeric form exhibits sensitizing properties, but polymerized versions show acceptable safety profiles when properly formulated.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Moderate
Comedogenicity Low

Our Assessment

Verdict

Optional

Functional ingredient with effective film-forming properties but requires expert formulation to balance efficacy with sensitization risk.

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References

Sources