Isooctane
AKA “4-Trimethylpentane, Pentane, ISO-OCTANE, HSDB 5682, EINECS 208-759-1, UNII-QAB8F5669O, NSC 39117, BRN 1696876”
Synthetic
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Ingredient Facts
Isooctane
AKA: 4-Trimethylpentane, Pentane, ISO-OCTANE, HSDB 5682, EINECS 208-759-1, UNII-QAB8F5669O, NSC 39117, BRN 1696876
Synthetic · Solvent | Skin Conditioning - Emollient | Texture Enhancing · EWG: 3
Plant-Derived
Emollient
Solvent
Skin Conditioner
Synthetic
Clean
A lightweight solvent that helps dissolve and blend other ingredients smoothly into the formula, ensuring even application and a silky texture.
Solubility PRACTICALLY INSOL IN WATER; SOMEWHAT SOL IN ABS ALC; SOL IN BENZENE, TOLUENE, XYLENE, CHLOROFORM, ETHER, CARBON DISULFIDE, CARBON TETRACHLORIDE, DMF & OILS, EXCEPT CASTOR OIL.
Formula
C8H18
Mol. Weight
114.23
CAS #
540-84-1
Form
Liquid
Plant-Derived
Synthetic. Isooctane is a branched hydrocarbon alkane derived from crude oil refining and petroleum distillation processes. It is produced through catalytic isomerization and fractionation of octane isomers during petroleum refining.
Function
Solvent | Skin Conditioning - Emollient | Texture Enhancing
Benefits
Quells irritation
Traditional Use
A synthetic hydrocarbon developed in the mid-20th century as a volatile solvent for cosmetics. Used to replace or supplement traditional solvents and to improve product spreadability and drying time.
Skin Types
all-skin-types
Best For
Target
General
Melanin-Rich Skin
Suitable
Pregnancy Safe
Yes
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR