Isobutane
AKA “2-Methylpropane, Trimethylmethane, 1-Dimethylethane, iso-butane, R 600a, Caswell No. 503A, R-600a, HSDB 608
Synthetic
Ingredient Facts
Isobutane
AKA: 2-Methylpropane, Trimethylmethane, 1-Dimethylethane, Iso-butane, R 600a, Caswell No. 503A, R-600a, HSDB 608
Synthetic · Propellant · EWG: 4
Synthetic
Synthetic
Clean
A lightweight propellant that helps deliver the product evenly from the aerosol bottle, ensuring consistent application every time you use it.
Solubility Slight (NIOSH, 2024)
Formula
C4H10
Mol. Weight
58.12
CAS #
75-28-5
Form
Liquid
State
Isobutane is a colorless gas with a faint petroleum-like odor. It is shipped as a liquefied gas under its vapor pressure. Contact with the liquid can cause frostbite. It is easily ignited. The vapors
See origin →
Functions
Propellant
Dispenses Product
Locks In Moisture
Propels product from container
Traditional Use
A hydrocarbon gas synthesized from petroleum in the 20th century. Adopted by the cosmetics industry as a propellant in aerosol sprays and foams, replacing earlier flammable propellants.
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 a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR