PEG-40 Sorbitan Diisostearate
AKA “Polysorbate 40 derivative, PEG sorbitan diisostearate
Synthetic
Ingredient Facts
Peg-40 sorbitan diisostearate
AKA: Polysorbate 40 derivative, PEG sorbitan diisostearate
Synthetic · Cleansing · EWG: 4
Plant-Derived Synthetic
Cleanser
Emulsifier
Synthetic
Clean
1,4-Anhydro-D-glucitol, diisooctadecanoates, ethoxylated (40 mol EO average molar ratio) Science: Origin: Botanic/Natural | Process: Ethoxylation | Functions: Surfactant - Cleansing, Surfactant - Emulsifying Safety Ratings: CIR: Safe as used
CAS #
-
Form
Liquid
See origin →
Functions
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Cleansing Surfactant
Emulsifier
Antioxidant Protection
Wound Healing
Removes Impurities
Mixes Oil & Water
Traditional Use
Developed in the mid-20th century as a synthetic emulsifier combining sorbitan (derived from sorbitol, a sugar alcohol) with polyethylene glycol and isostearic acid. Designed for stable oil-in-water emulsification in cosmetics.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe w/Qualifications
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
CANADApermitted
Regulatory Agencies
Verified Feb 2026
Data: CosIng · EWG · CIR