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Moumoujus

CYCLOTRISILOXANE.

Avoid CAS 541-05-9 / HAIR CONDITIONING, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SOLVENT

Cyclotrisiloxane (D3) is a volatile cyclic silicone engineered to provide a non-greasy, dry-smooth skin feel as it evaporates. It functions as an effective solvent and a conditioning agent for both skin and hair in cosmetic formulations.

Summary

Solvent Hair Conditioning Agent Skin Conditioning Agent Film Former

Science

Mechanism of Action

This low-molecular-weight silicone functions by rapidly volatilizing from the skin and hair surface, imparting a characteristic dry-smooth sensation without leaving a heavy residue. Its strong solvent properties enable it to dissolve various cosmetic ingredients. On the skin, it aids in conditioning by forming vapor-permeable protective films, contributing to skin maintenance, softening, and smoothing. For hair, it enhances manageability, suppleness, shine, and volume, facilitating easier combing.

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

Cyclotrisiloxane is stable under normal temperatures and pressures. However, it is highly sensitive to moisture and can decompose in the presence of water, requiring storage and formulation in anhydrous conditions.

Conflicts

  • moisture

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Unknown

The Cosmetic Ingredient Review (CIR) Expert Panel has not conducted a specific safety assessment with a 'safe as used' conclusion for Cyclotrisiloxane (D3). While related cyclic siloxanes (D4-D7) have shown generally low irritation/sensitization potential in CIR assessments, this does not directly apply to D3. Notably, the European Union has classified Hexamethylcyclotrisiloxane (D3) as a Substance of Very High Concern (SVHC) under the REACH regulation due to its potential to harm human health and the environment. EWG Skin Deep rates Cyclotrisiloxane as 'Unacceptable' for their VERIFIED products, citing concerns regarding moderate persistence, bioaccumulation, low-moderate non-reproductive organ system toxicity, and limited evidence of liver and reproductive toxicity. The FDA does not pre-approve cosmetic ingredients; manufacturers are responsible for product safety.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

Due to its classification as a Substance of Very High Concern by the European Union and noted concerns regarding persistence, bioaccumulation, and potential toxicity, Cyclotrisiloxane is deemed unsuitable for Moumoujus formulations.

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