Oleth-30
AKA “Triethoxyoctylsilane, Triethoxy(octyl)silane, Octyltriethoxysilane, triethoxycaprylylsilane, Octyl(triethoxy)silane, Dynasylan OCTEO, Prosil 9202, Silquest A 137
Synthetic
Ingredient Facts
Oleth-30
AKA: Triethoxyoctylsilane, Triethoxy(octyl)silane, Octyltriethoxysilane, Triethoxycaprylylsilane, Octyl(triethoxy)silane, Dynasylan OCTEO, Prosil 9202, Silquest A 137
Synthetic · Cleansing · EWG: 4
Synthetic
Cleanser
Emulsifier
Synthetic
Clean
Gently removes dirt and oil while helping blend water and oil-based ingredients together for a smooth, clean feel.
Effective at 9.03%
Formula
C14H32O3Si
Mol. Weight
276.49
CAS #
9004-98-2
Form
Liquid
State
Dry Powder; Liquid; Dry Powder, 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.
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.
Removes Impurities
Cleansing Surfactant
Emulsifier
Mixes Oil & Water
Traditional Use
Synthetic surfactant and emulsifier developed in the mid-20th century by ethoxylating oleyl alcohol. These polyethylene glycol derivatives were created to provide stable emulsification and solubilization properties in cosmetics and pharmaceuticals.
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
Concentration Guide
0.06%
18.0%
0%25%
Effective Range
CIR reported use: 0.1-18 | 0.3-10 | 1-4 | 0.06-10
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
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Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR