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Overview
Polymethylene polyphenyl polyisocyanate (PAPI) is a crude MDI mixture produced via phosgenation of diphenylmethane diamine. Its general formula varies by grade, typically represented as C₁₅H₁₀N₂O₂ derivatives with CAS No. 10168-37-9.
Application
- Rigid foam insulation for refrigeration and building panels
- Adhesives and sealants in automotive manufacturing
- Coatings for industrial machinery and pipelines
- Foam-in-place applications for aerospace components
Precautions
Strictly avoid inhalation; requires full respiratory protection. Store in dry, ventilated areas below 25°C away from moisture to prevent polymerization. Not for pharmaceutical use due to toxicity risks.