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Moumoujus

BUTANE.

Essential CAS 106-97-8 / PROPELLANT

Butane is a colorless, odorless liquefied gas that serves as an aerosol propellant in cosmetic formulations. With its extremely low boiling point of -0.5°C, it evaporates instantly upon skin contact, making it an effective delivery mechanism for sprays and foams. Despite being present at concentrations up to 60% in aerosol products, its volatile nature eliminates skin contact concerns.

Summary

propellant

Science

Mechanism of Action

Functions exclusively as a propellant system by existing as a pressurized liquid that rapidly expands into gas when released, creating the force needed to dispense cosmetic formulations as fine mists or foams while immediately evaporating from skin surface.

Research

Clinical Evidence

High confidence
Effective range 0.5–60%
Optimal

N/A

Key findings

  1. 01 Patch testing with 100% butane on 10 human subjects showed no skin irritation due to complete volatility
  2. 02 OECD chromosome aberration testing at 0.5-8.0% demonstrated no mutagenic activity in human lymphocytes
  3. 03 LC50 inhalation studies confirmed safety margins above 20,000 ppm for cosmetic use scenarios

Transparency

Dusting Analysis

Not commonly dusted

Not applicable for propellant ingredients as they serve essential functional purposes and cannot be meaningfully reduced without compromising product delivery mechanism.

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Chemically stable under standard conditions but requires pressurized storage to maintain liquid state; highly flammable and must be handled with appropriate safety protocols

Conflicts

  • Strong oxidizing agents
  • Halogens
  • Hydrogen chloride
  • Oxygen under certain conditions

Safety

Safety Profile

CIR Status
Safe as used
Max tested
60%
Pregnancy
Safe
Sensitization risk Low

CIR Expert Panel reaffirmed safety status in 2023; EU restrictions apply if butadiene impurity levels reach ≥0.1% w/w

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Essential

An indispensable propellant ingredient with excellent safety profile and universal skin compatibility, enabling effective aerosol product delivery.

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