Isobutane
Also known as: E943b
Isobutane is approved as a propellant for foods in both the US and EU. At intended use levels and considering its volatility, dietary exposure is minimal.
What it is
Isobutane (2-methylpropane), a hydrocarbon gas used as a propellant.
Aerosol propellant in food sprays such as cooking oil and whipped cream.
Why it's flagged
- Inhalation hazard of pure gas (not relevant in finished food)
- Flammable propellant
What regulators actually say
"Isobutane is the chemical 2-methylpropane... used as an aerosol propellant in vegetable oil pan coating sprays."
"The Panel concluded that there is no safety concern for the use of butane (E 943a), isobutane (E 943b) and propane (E 944) as propellants in vegetable oil pan sprays and water-based emulsions."
Regulatory status
United States — FDA
Approved as direct food additive (21 CFR 184.1165 isobutane as propellant)
European Union — EFSA
Approved as E943b food additive (propellant)
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