Caprylyl Methicone
AKA: 17955-88-3, 1, 3, 5, 5-Heptamethyl-3-octyltrisiloxane, Caprylyl trisiloxane, Trisiloxane, Heptamethyloctyltrisiloxane, Octylheptamethyltrisiloxane, SILSOFT 034
Synthetic
Emollient
Skin Conditioner
Silicone
Plant Oil
Synthetic
Clean
The Expert Panel for Cosmetic Ingredient Safety concluded that the following 30 dimethicone, methicone, and substituted-methicone polymers are safe in cosmetics in the present practices of use and concentration described in this safety assessment when formulated to be non-irritating, with the exception that the available data are insufficient to make a determination of safety for use of these ingredients in products that may be incidentally inhaled when applied using airbrush devices: Caprylyl Methicone
Formula
C15H38O2Si3
Mol. Weight
334.72
CAS #
17955-88-3
Form
Liquid
State
Liquid
Functions
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Conditions Skin
Softens & Smooths
Skin Types
●all-skin-types
Best For
General
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory0 listings
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR