Phenyl Dimethicone
AKA: Phenyl simethicone, POLY(PHENYLMETHYLSILOXANE), 9005-12-3, Polyphenylmethylsiloxane, MW 2500-2700, 4543-12-8, METHYL(PHENYL)SILANONE, Methylphenylsilanone, C7H8OSi
Synthetic
Skin Conditioner
Silicone
Clean
1,1,3,3-Tetramethyl-1,3-diphenyldisiloxane; Poly(methyl phenyl siloxane)
Formula
C7H8OSi
Mol. Weight
136.22
CAS #
9005-12-3
Form
Liquid
Functions
Antifoaming
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Locks in moisture
Traditional Use
A synthetic silicone-based ingredient developed in the mid-20th century for cosmetics. Created to provide lightweight slip and conditioning benefits to skincare and makeup while avoiding the heavy feel of traditional oils.
EWG
2
CIR
Safe as used
Pregnancy
Yes
Restricted By
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Agencies
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️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