Science
Mechanism of Action
MDI reacts readily with skin proteins, such as albumin, to form stable conjugates. These MDI-protein complexes function as antigens, triggering an immune sensitization process that can lead to subsequent allergic reactions and inflammatory responses upon re-exposure.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
MDI is a potent irritant and sensitizer, explicitly contra-indicated for dermal application. Its extreme reactivity and documented health hazards make its inclusion in cosmetic formulations inappropriate and highly unsafe, posing risks such as skin burns, dermatitis, and severe allergic reactions.
The Formula
Formulation
Stability
MDI exhibits extreme instability in the presence of water, including atmospheric moisture, undergoing rapid hydrolysis. This reaction generates 4,4'-methylenedianiline (MDA) and insoluble polyureas, rendering it unsuitable for aqueous solutions. It also degrades in dimethyl sulfoxide (DMSO).
Conflicts
- Water
- Moisture
- Compounds with active hydrogens (e.g., polyols, amines)
- DMSO
Safety
Safety Profile
MDI is a potent dermal and respiratory sensitizer, asthmagen, and strong irritant, capable of causing skin burns, dermatitis, and eczema upon acute contact. While the EPA classifies MDI as Group D (not classifiable as to human carcinogenicity due to inadequate human evidence), the Government of Canada has concluded that MDIs pose a danger to human life and health, citing risks including respiratory problems, irritation, and potential cancer. It demonstrates low acute toxicity via oral and dermal routes but is considered toxic through inhalation.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Methylene Diphenyl Diisocyanate is a highly hazardous industrial chemical with significant dermal irritant and sensitizing properties, rendering it entirely unsuitable and unsafe for any cosmetic application.
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References
Sources