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Moumoujus

STEARYL ACRYLATE.

Valuable CAS 4813-57-4 / NOT REPORTED

Stearyl Acrylate is a long-chain alkyl acrylate monomer that imparts hydrophobicity and flexibility to polymer systems. In cosmetic formulations, typically as a component of copolymers, it helps improve product texture, ensures smooth application, and contributes to a soft skin feel while supporting moisture retention. It functions primarily as a film-former and rheology modifier.

Summary

Film-forming Viscosity Controlling Texture Enhancing Stabilizing Moisture Retention Aid Skin Softening

Science

Mechanism of Action

Stearyl Acrylate's long alkyl chain reduces intermolecular friction, leading to enhanced softness and surface smoothness in polymer films formed on the skin. It improves water repellency and facilitates uniform film creation, which is crucial for even product distribution. When incorporated into copolymers, it also provides formulation stabilization, optimizes texture, and assists in maintaining skin hydration by forming a protective barrier.

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

To prevent polymerization, Stearyl Acrylate requires storage under an oxygenated atmosphere (never inert gases) to ensure the stabilizer's efficacy. The storage temperature should not exceed 35 °C for a one-year shelf life. While crystallized material can be melted at up to 60 °C, storage at this elevated temperature should not exceed 5 days to avoid degradation and premature polymer formation.

Conflicts

  • Oxidizing agents
  • Incompatible chemicals
  • Iron(III)-ions

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
0.15%
Sensitization risk Moderate

The Cosmetic Ingredient Review (CIR) Expert Panel concluded that 126 acrylates copolymers, which can contain Stearyl Acrylate as a monomer, are safe in cosmetics when formulated to be non-irritating. A specific copolymer was reported to contain up to 0.15% (1500 ppm) of residual stearyl acrylate monomer. The raw Stearyl Acrylate monomer itself is classified as an irritant and potential sensitizer (GHS H315, H317, H319, H335), necessitating strict handling protocols including avoiding direct contact with skin and eyes, preventing vapor inhalation, and using appropriate personal protective equipment during manufacture.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Stearyl Acrylate is a valuable formulation ingredient, primarily as a copolymer component, enhancing texture, film formation, and application quality in various cosmetic products when used within defined safety limits.

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