Common Name(s): Propyl trimethicone,propyl trimethicone,cosmetic functional ingredient,established active
CAS Number: N/a
DESCRIPTION
What It Does: Delivers silicone characteristic smooth skin feel from the si-o backbone's low surface energy (20 mn/m) and molecular flexibility.
Why It's Used: Propyl trimethicone is selected for the specific si-o substitution pattern of its siloxane backbone โ the methyl, alkyl, or functional group arrangement determines the unique combination of surface energy, volatility, and spreading that distinguishes propyl trimethicone from other silicone grades.
How It Works: Si-o backbone flattens against skin maximising contact; methyl surface energy 20 mn/m provides dry non-tacky character; functional modifications extend performance scope.
Typically Found In: Cosmetic formulations
TECHNICAL DETAILS
Primary Category: Active ingredient โ cosmetic active
Secondary Functions: Skin conditioning
Application Areas:
Facial Skincare
Body Care
Hair Care
Beard Care
Color Cosmetics (Makeup)
Dietary/Oral Supplements
Typical Concentration Range: 0.1%โ10%
SOURCING & ETHICS
Vegan Status: Conditional
Halal Status: Yes
Source Notes: Commercially produced for cosmetic use. verify vegan/halal status with supplier.
SKIN COMPATIBILITY
Irritancy Rating: 1/5 โ very low
Comedogenicity Rating: 0/5 โ non-comedogenic
Sensitivity Concerns: Well-tolerated by most skin types.
Safe for Sensitive Skin: Yes
SAFETY & COMPATIBILITY
Safety Profile: Good safety profile at recommended concentrations. ewg score: 1โ2.
Works Well With: Standard skincare actives
Avoid Combining With: No known significant incompatibilities
SCIENTIFIC NOTE
Safety documented in cosing at standard formulation concentrations.
Last Verified: Cosing database,propyl trimethicone technical review
Primary Sources: 2026-03-22