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Moumoujus

PROPYL TRISILOXANE.

Valuable CAS 29054-80-6 / HAIR CONDITIONING, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SOLVENT

Propyl Trisiloxane is a lightweight siloxane known for its excellent spreading properties, forming a vapor-permeable film that conditions and smooths skin while reducing moisture loss. It imparts a desirable non-greasy, dry-smooth finish and can enhance the penetration of other active ingredients.

Summary

Skin Conditioning Emollient Solvent Reduces Moisture Loss Enhances Active Penetration Antifoaming

Science

Mechanism of Action

This ingredient functions as a skin conditioning agent, emollient, and solvent. Its inherently low surface tension facilitates superior spreading across the skin's surface. Upon application, it establishes a protective, vapor-permeable film, which effectively softens and smooths the skin, contributing to reduced transepidermal water loss. Its volatile nature provides a lightweight, non-greasy, and dry-smooth tactile experience. Additionally, Propyl Trisiloxane can improve the efficacy and dermal uptake of other active components within a formulation.

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 7 – 9.9
0 7 14

Stability

Propyl Trisiloxane exhibits hydrolytic lability, meaning its siloxane bonds are susceptible to degradation in aqueous environments, particularly at elevated temperatures and extreme pH values. Formulations showed instability (haziness, loss of foaming) at pH 10 after three days and pH 4 after one day. Stability can be improved by incorporating a small immiscible hydrocarbon phase. Optimal storage is between 5-30°C in tightly sealed original containers.

Synergies

  • Enhances the effectiveness and penetration of other active ingredients

Conflicts

  • Oxidizing agents
  • Peroxides
  • Strong acidic conditions (e.g., pH 4 or lower)
  • Strong alkaline conditions (e.g., pH 10 or higher)

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Low

While Propyl Trisiloxane itself has not undergone a dedicated Cosmetic Ingredient Review (CIR) assessment, related siloxanes and dimethicones have been evaluated and deemed safe for cosmetic use. It holds a low hazard score of 2 on the Environmental Working Group's (EWG) skin-deep scale and is recognized by Health Canada as an acceptable non-medicinal ingredient. Although generally well-tolerated, some individuals with sensitive skin may experience irritation.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Propyl Trisiloxane is a valuable cosmetic ingredient, offering lightweight conditioning, moisture retention, and improved active ingredient delivery with a non-greasy feel and low risk of irritation or comedogenicity.

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