Phenyl Dimethicone
AKA “Phenyl simethicone, RefChem:861585, POLY(PHENYLMETHYLSILOXANE), 9005-12-3, Polyphenylmethylsiloxane, MW 2500-2700, 4543-12-8, METHYL(PHENYL)SILANONE, methylphenylsilanone, C7H8OSi”
Skin Conditioning
Ingredient Facts
Phenyl dimethicone
AKA: Phenyl simethicone, RefChem:861585, POLY(PHENYLMETHYLSILOXANE), 9005-12-3, Polyphenylmethylsiloxane, MW 2500-2700, 4543-12-8, METHYL(PHENYL)SILANONE, Methylphenylsilanone, C7H8OSi
Skin Conditioning · Antifoaming · EWG: 2
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
See origin →
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.
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
EWG
2
CIR
Safe as used
Pregnancy
Yes
Restricted By
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Agencies
Diphenyl Dimethicone
European Commission
EU Cosmetic Ingredient Database (CosIng)
Diphenyl Dimethicone Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
Diphenyl Dimethicone/Vinyl Diphenyl Dimethicone/Silsesquioxane Crosspolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
Phenyl Dimethicone
European Commission
EU Cosmetic Ingredient Database (CosIng)
Allergic reaction to phenyl dimethicone in a sunscreen.
Edwards EK Jr, Edwards EK
Archives of dermatology, 1984
Diphenyl Dimethicone
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Diphenyl Dimethicone Crosspolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Diphenyl Dimethicone/Vinyl Diphenyl Dimethicone/Silsesquioxane Crosspolymer
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Phenyl Dimethicone
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR