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Moumoujus

POLYMETHYLSILSESQUIOXANE.

Valuable CAS 68554-70-1 / OPACIFYING

Polymethylsilsesquioxane is a spherical silicone powder utilized in skincare and cosmetics for its multifaceted benefits, primarily enhancing skin texture and appearance. It forms a protective, non-occlusive film that smooths the skin, blurs imperfections, and controls shine, making it a valuable addition to precision formulations.

Summary

Texture enhancer Soft focus agent Temporary wrinkle filler Film former Skin conditioning agent Mattifying Oil absorber Enhances spreadability Water resistant Prevents moisture loss

Science

Mechanism of Action

This ingredient functions as both a film former and skin conditioning agent, creating a resilient, thin film on the skin's surface. This film effectively minimizes transepidermal water loss and provides a barrier against environmental stressors. Its unique spherical structure allows it to optically diffuse light, producing a soft-focus effect that visibly reduces the appearance of fine lines, wrinkles, and enlarged pores. Furthermore, it absorbs excess sebum, delivering a mattifying finish, while also improving the sensory feel and spreadability of formulations.

Research

Clinical Evidence

High confidence
Effective range 2–10%
Optimal

N/A

Key findings

  1. 01 Effectively refracts light, creating a soft-focus effect that camouflages the appearance of wrinkles.
  2. 02 Significantly improves skin feel, gloss, and imparts a desirable powdery, softening effect in emulsified skincare systems.
  3. 03 Confers anti-caking properties and enhances smooth surface feel in various make-up formulations.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH 6 – 8
0 7 14

Stability

Polymethylsilsesquioxane exhibits robust thermal and chemical stability, contributing to the overall stability and extended shelf life of cosmetic formulations. Its optimal stability is observed within a pH range of 6.0 to 8.0.

Conflicts

  • Aluminium hydroxide
  • Methicone
  • Mica
  • Isopropyl Palmitate

Safety

Safety Profile

CIR Status
Safe as used
Max tested
55.2%
Sensitization risk Low

The independent Cosmetic Ingredient Review (CIR) panel has affirmed Polymethylsilsesquioxane's safety for cosmetic use, reporting no evidence of toxicity or sensitization. Its large molecular size prevents skin absorption. While concentrations typically range below 4.9%, it has been safely formulated up to 55.2%. It is considered non-toxic and non-irritating to skin and mucous membranes, with demonstrated safety for sensitive skin at concentrations up to 15%. Direct contact with eyes may cause irritation.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Polymethylsilsesquioxane is a highly valuable ingredient for its ability to immediately enhance skin texture and appearance while providing broad compatibility and robust safety across diverse formulations.

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