PPG-9
AKA “Polypropylene Glycol 9, Propylene Glycol Polymer”
Skin Conditioning
Ingredient Facts
PPG-9
AKA: Polypropylene Glycol 9, Propylene Glycol Polymer
Skin Conditioning · Skin Conditioning · EWG: 1
Synthetic
Skin Conditioner
Clean
Poly[oxy(methyl-1,2-ethanediyl)], .alpha.-hydro-.omega.-hydroxy- (9 mol PO average molar ratio)
CAS #
25322-69-4
Form
Liquid
See origin →
Functions
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
Developed in the mid-20th century as a synthetic humectant and solvent. Created as a propylene glycol derivative to retain moisture in cosmetic formulations and improve product stability.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
1
CIR
Safe as used
Pregnancy
Yes
Restricted By
CIR Safety Findings
medical-approval
all-shades-safe
Regulatory Agencies
Amended Final Report on the Safety Assessment of PPG-9-Buteth-12, PPG-12-Butheth-16, PPG-26-Buteth-26, and PPG-28-Butheth-35
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Final Report on the Safety Assessment of PPG-12-Buteth-16, PPG-9-Buteth-12, PPG-26-Buteth-26 and PPG-28-Buteth-35
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Final Report on the Safety Assessment of PPG-9, -25, and -40 Diethylmonium Chloride
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
PEG/PPG-9/2 Dimethyl Ether
European Commission
EU Cosmetic Ingredient Database (CosIng)
PPG-9
European Commission
EU Cosmetic Ingredient Database (CosIng)
PPG-9 Butyl Ether
European Commission
EU Cosmetic Ingredient Database (CosIng)
PPG-9 Diethylmonium Chloride
European Commission
EU Cosmetic Ingredient Database (CosIng)
PPG-9-Buteth-12
European Commission
EU Cosmetic Ingredient Database (CosIng)
PPG-9-Ethylhexeth-5
European Commission
EU Cosmetic Ingredient Database (CosIng)
PPG-9-Steareth-3
European Commission
EU Cosmetic Ingredient Database (CosIng)
PEG/PPG-9/2 Dimethyl Ether
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
PPG-9
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
PPG-9 Diethylmonium Chloride
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Verified Jun 2026
Data: CosIng · EWG · CIR