Ingredient
Isobutane
What is Isobutane?
Isobutane is a colorless gas that is part of the butane family, often obtained during the refining of natural gas and oil. It is used in a variety of industries, primarily as a propellant in aerosol sprays due to its ability to vaporize and release other substances effectively.
In cosmetics and personal care products like sunscreens, isobutane helps to deliver the product in a fine mist, allowing for a more even application. Its health impacts in products are generally linked to inhalation risks during use as an aerosol, although direct topical exposure is often considered limited.
When you encounter isobutane on a label, be aware that its role is functional, aiding in the application of the product rather than contributing to its primary health or cosmetic benefits.
Commonly found in: Sunscreens, Hairsprays, Deodorants, Shaving creams, Cooking sprays
What to watch
- Exposure as an inhalant may lead to respiratory irritation.
- Classified as a low-level explosive risk under certain conditions.
The FDA allows isobutane as a propellant in aerosol products but cautions about its flammability and recommends usage in well-ventilated areas.
Research highlights potential respiratory effects from inhalation; however, standard cosmetic use poses limited systemic risk.
Isobutane is a synthetic compound and is typically considered vegan.
Sources: FDA Propellants Guideline
Scout's take
Isobutane is an aerosol propellant that delivers fine mist particles easily inhaled during application. Aerosol sunscreens were central to the 2021 benzene contamination recalls, and inhalation exposure to propellant-carried chemical filters is a serious concern.
More from Scout's analyses
Isobutane propels a fine body mist that is easily inhaled during application. Aerosol sunscreens were implicated in the 2021 benzene recalls, and mist formats maximize inhalation exposure to chemical UV filters.
from the analysis of Neutrogena Ultra Sheer Body Mist Sunscreen Broad Spectrum SPF 70Isobutane aerosol propellant creates inhalation risk during outdoor sport use, especially when wind disperses spray mist. Aerosol formats were linked to benzene contamination in the 2021 recalls.
from the analysis of Neutrogena Cool Dry Sport Sunscreen Spray Broad Spectrum SPF 50Isobutane aerosol propellant creates inhalation exposure during full-body spray application. Aerosol sunscreens were implicated in the 2021 benzene recalls affecting J&J brands including Aveeno.
from the analysis of Aveeno Protect + Refresh Sunscreen Broad Spectrum Body Spray SPF 60Found in 5 products
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