Butoxyethanol
AKA “2-Butoxyethanol, Butyl glycol, Butyl cellosolve, ETHYLENE GLYCOL MONOBUTYL ETHER, Ethylene glycol butyl ether, n-Butoxyethanol, Butyl oxitol, Dowanol EB
Synthetic
Ingredient Facts
Butoxyethanol
AKA: 2-Butoxyethanol, Butyl glycol, Butyl cellosolve, ETHYLENE GLYCOL MONOBUTYL ETHER, Ethylene glycol butyl ether, N-Butoxyethanol, Butyl oxitol, Dowanol EB
Synthetic · Emollient · EWG: 8
Synthetic
Emollient
Cleanser
Solvent
Skin Conditioner
Synthetic
Not Clean
A lightweight solvent that helps blend ingredients smoothly and keeps the formula at the right consistency for easy application.
Solubility greater than or equal to 100 mg/mL at 72 °F (NTP, 1992)
Formula
C6H14O2
Mol. Weight
118.17
CAS #
111-76-2
Form
Liquid
State
Ethylene glycol monobutyl ether appears as a colorless liquid with a mild, pleasant odor. Less dense than water. Flash point 160 °F. Irritates skin and eyes and may be toxic by ingestion. Used as a so
See origin →
Functions
Solvent
Dissolves other ingredients so they distribute evenly in the formula. Often the invisible "base" everything else is mixed into.
Viscosity Controlling
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Moisturizing
Locks in moisture to keep skin soft and supple throughout the day
Strengthens Barrier
Provides scent
Dissolves other ingredients
Controls product thickness
Traditional Use
A synthetic solvent first synthesized in the early 20th century and incorporated into cosmetics as a solubilizer and preservative booster. It has no traditional cosmetic or medicinal use.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Caution
EWG
8
CIR
Safe w/Qualifications
Pregnancy
Caution
CIR Safety Findings
Not a Sensitizer
ewg-8
medical-approval
all-shades-safe
Concentration Guide
4.0%
0%6%
Reg. Limit
EU regulatory limit: 4.0%. a) 4.0% b) 2.0% Source: EU Cosmetics Regulation (EC) 1223/2009, Annex III (Restricted Substances), Entry 188.
Regulatory Status
USApermitted
EUpermitted
JAPANpermitted
CANADApermitted
🧂Conflict of interest.
Explaining skin permeation of 2-butoxyethanol from neat and aqueous solutions.
Bunge AL, Persichetti JM, Payan JP
International journal of pharmaceutics, 2012
Final Report on the Safety Assessment of Butoxyethanol
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Final Report on the Safety Assessment of Glycolic Acid, Ammonium, Calcium, Potassium, and Sodium Glycolates, Methyl, Ethyl, Propyl, and Butyl Glycolates, and Lactic Acid, Ammonium, Calcium, Potassium,
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Tentative Report: Amended Safety Assessment of Butoxyethanol as Used in Cosmetics
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Butoxyethanol
European Commission
EU Cosmetic Ingredient Database (CosIng)
Butyl Glycolate
European Commission
EU Cosmetic Ingredient Database (CosIng)
Butoxyethanol
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Butoxyethanol
Health Canada
Health Canada Cosmetic Ingredient Hotlist
Verified Feb 2026 · 🧪 = conflict
Data: PubChem · CosIng · EWG · CIR