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MEK PEROXIDES.

Avoid CAS - / ANTIMICROBIAL, PRESERVATIVE

Methyl Ethyl Ketone Peroxide (MEKP) is a highly corrosive and toxic organic peroxide primarily used in industrial settings. It is unequivocally unsuitable for cosmetic applications due to its severe hazardous properties and lack of safety approval.

Summary

Science

Mechanism of Action

MEK Peroxides act as potent oxidizing agents in biological systems. Upon contact with metal ions, particularly iron, they rapidly generate highly reactive alkylperoxyl radicals. These radicals induce oxidative stress, leading to the denaturation of organic molecules and the peroxidation of lipids, which causes extensive tissue damage. The acidity of the resulting chemical byproducts further exacerbates this damage.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted
Red flag below
0%

MEK Peroxides are prohibited from use in cosmetic formulations; therefore, any concentration above 0% is considered a critical safety violation. Its extreme toxicity and corrosive nature preclude its inclusion in any skincare product.

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

MEK Peroxide is an inherently unstable organic peroxide, prone to thermal instability and exothermic self-accelerating decomposition. It is also sensitive to light. To mitigate its reactivity and prevent explosive decomposition, it is typically supplied commercially as a 30-60% solution stabilized in agents such as dimethyl phthalate.

Conflicts

  • strong acids
  • alkalis
  • heavy metal compounds (especially cobalt, iron, copper)
  • oxidizing materials
  • combustible materials
  • strong reducing agents
  • natural rubbers
  • synthetic rubbers
  • chemical accelerators
  • acetone
  • mineral acids
  • amines
  • hot solutions (over 38°C / 100°F)

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
0%
Sensitization risk High

Methyl Ethyl Ketone Peroxide is a highly toxic and corrosive substance, categorized under United Nations Hazard class 5.2. It causes severe chemical burns upon skin contact and can lead to irreversible eye damage or blindness. Animal studies involving 45% MEKP demonstrated necrotic, inflammatory, and regenerative lesions on the skin. There is no FDA approval for its use in cosmetic products, and its maximum allowable concentration is 0% in such applications. Exposure must be entirely avoided.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
No Sensitive
Irritancy High
Comedogenicity Unknown

Our Assessment

Verdict

Avoid

MEK Peroxides are highly toxic and corrosive industrial chemicals completely unsuitable for skincare formulations due to their severe hazards and lack of regulatory approval.

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