C9-12 Isoparaffin
AKA “Isoparaffin C9-12
Synthetic
Ingredient Facts
C9-12 isoparaffin
AKA: Isoparaffin C9-12
Synthetic · Emollient · EWG: 4
Synthetic
Emollient
Solvent
Skin Conditioner
Synthetic
Clean
C9-12 Isoparaffin is a mixture of branched aliphatic hydrocarbons with 9 to 12 carbons in the alkyl chain Science: Functions: Solvent, Viscosity Controlling Safety Ratings: CIR: Safe as used
CAS #
-
Form
Powder
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
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Slip Agent
Dissolves Ingredients
Controls Viscosity
Dissolves other ingredients
Controls product thickness
Traditional Use
Refined petroleum hydrocarbon developed for cosmetic use in the 20th century. Serves as a volatile emollient and solvent in makeup and skincare products.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe
Pregnancy
Yes
CIR Safety Findings
Not an Irritant
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR