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Isododecane
AKA “2-Methylundecane, 7045-71-8, Undecane, 2-methyl-, H40FL8477B, EINECS 230-323-4, DTXSID50873241, 2methyl, RefChem:476305, DTXCID5021590, 230-323-4”
Emollient
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Ingredient Facts
Isododecane
AKA: 2-Methylundecane, 7045-71-8, Undecane, 2-methyl-, H40FL8477B, EINECS 230-323-4, DTXSID50873241, 2methyl, RefChem:476305, DTXCID5021590, 230-323-4
Emollient · Emollient · EWG: 1
Synthetic
Emollient
Fragrance
Solvent
Skin Conditioner
Clean
2,2,4,6,6-Pentamethylheptane; Hydrocarbons, C4, 1,3-butadiene-free, polymd., triisobutylene fraction, hydrogenated
Formula
C12H26
Mol. Weight
170.33
CAS #
31807-55-3, 93685-81-5, 13475-82-6
Form
Liquid
See origin →
Functions
Perfuming
Added for scent. Can be natural or synthetic. Common irritant and allergen — one of the top reasons people react to products.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Solvent
Dissolves other ingredients so they distribute evenly in the formula. Often the invisible "base" everything else is mixed into.
Locks In Moisture
Traditional Use
Synthetic hydrocarbon created in the mid-20th century as a volatile silicone alternative. Used in cosmetics as a lightweight emollient and carrier fluid with no traditional counterpart.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not an Irritant
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Anti-Allergic and Anti-Inflammatory Effects of Undecane on Mast Cells and Keratinocytes.
Choi D, Kang W, Park T
Molecules (Basel, Switzerland), 2020
→
Final Report on the Safety Assessment of 2-Methyl-5-Hydroxyethylaminophenol
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
→
2-Methyl-5-Hydroxyethylaminophenol
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Isododecane
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
2-Methyl-1-Phenyl-2-Propanol
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
2-Methyl-5-Hydroxyethylaminophenol
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Isododecane
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Undecane
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
2-Methyl-m-phenylenediamine
Health Canada
Health Canada Cosmetic Ingredient Hotlist
→
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR