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POLYETHYLMETHACRYLATE.

Valuable CAS 9003-42-3 / BINDING

Polymethylmethacrylate (PMMA) is a synthetic polymer frequently employed in skincare and cosmetics as a versatile film-forming agent and texture enhancer. Its microscopic spherical particles are adept at scattering light, providing a sophisticated blurring effect, and contributing to a luxurious, velvety skin feel in formulations.

Summary

Film forming Texture enhancer Soft focus/blurring agent

Science

Mechanism of Action

Topically, PMMA functions primarily through a physical mechanism. Its spherical particles create a smooth, breathable film on the skin's surface, contributing to a refined texture and a 'ball-bearing effect' that minimizes friction and enhances glide. These particles also effectively diffuse incident light, resulting in a soft-focus or blurring aesthetic. It is important to note that while PMMA microspheres are known to stimulate neocollagenesis when directly injected as dermal fillers, this collagen-stimulating property is not applicable or relevant to its topical cosmetic use.

Research

Clinical Evidence

High confidence
Effective range 0.01–45%
Optimal

N/A

Key findings

  1. 01 PMMA is incorporated into various cosmetic products at concentrations ranging from 0.01% to 45%, as documented by the Personal Care Products Council, reflecting its widespread use as a functional ingredient.
  2. 02 A study involving intradermal application of poly(methyl methacrylate) hydrogel in rabbits demonstrated a primary irritation index of 0, indicating no skin irritation response.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

PMMA generally exhibits stability; however, it can swell and dissolve in numerous organic solvents. Its ester groups are prone to hydrolysis, leading to poor resistance against many chemicals. It is incompatible with strong oxidizing agents.

Conflicts

  • Many organic solvents (can cause swelling and dissolution)
  • Strong oxidizing agents
  • Chemicals that cause hydrolysis of ester groups
  • Polymers with poor miscibility (can lead to phase separation)

Safety

Safety Profile

CIR Status
Safe as used
Max tested
45%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Panel has concluded that Polymethyl Methacrylate is safe for use as a cosmetic ingredient at concentrations up to 45%. Furthermore, the FDA has approved PMMA for use in various medical devices, including implants, and as an indirect food additive, signifying a robust safety profile even at significantly higher systemic exposures than those encountered in topical cosmetic applications.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Polymethylmethacrylate is a valuable cosmetic ingredient, highly regarded for its ability to enhance skin texture, provide a soft-focus visual effect, and form a lightweight film, all while maintaining a strong and well-documented safety profile for topical application.

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