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Isobutane

Description

Isobutane is a colorless, odorless, and highly volatile hydrocarbon commonly used as a propellant in aerosol-based skincare and cosmetic products. This lightweight gas is derived from petroleum and natural gas sources, and its chemical formula is C4H10. In skincare formulations, isobutane serves primarily as a delivery mechanism, allowing for the even distribution of active ingredients when dispensed from pressurized containers.

The low boiling point of isobutane (-11.7°C) enables it to rapidly evaporate upon contact with skin, leaving behind the desired product without residue. This property makes it particularly useful in spray-on sunscreens, dry shampoos, and quick-drying facial mists. Isobutane is often used in combination with other propellants like propane and butane to achieve optimal spray characteristics and product stability.

While isobutane is generally considered safe for topical use, it's important to note that it can be irritating to eyes and mucous membranes if inhaled in high concentrations. Formulators must adhere to strict safety guidelines and concentration limits set by regulatory bodies. Additionally, as a hydrocarbon, isobutane contributes to volatile organic compound (VOC) emissions, which has led to increased scrutiny and efforts to develop more environmentally friendly alternatives in recent years.