PEG-8 Diisostearate
molecular structure · PubChem
AKA: Polyethylene Glycol 8 Diisostearate, PEG-8 Diisostearic Acid Ester
Plant-Derived
Cleanser
Emulsifier
Not Clean
Poly(oxy-1,2-ethanediyl), .alpha.-hydro-.omega.-hydroxy-, diesters with isooctadecanoic acid (8 mol EO average molar ratio)
Form
Liquid
Functions
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Emulsifier
Mixes Oil & Water
Traditional Use
Modern emulsifier created from branched stearic acid derivatives and PEG technology in the 20th century. Developed to improve the stability and texture of oil-based and mixed-phase cosmetic products.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Agencies
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: CosIng · EWG · CIR