Polymethylene polyphenylene isocyanate

{{Use dmy dates|date=September 2023}}

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| OtherNames = Polymeric diphenylmethane diisocyanate; Poly((phenyl isocyanate)-co-formaldehyde);

Polymethylene polyphenyl polyisocyanate

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| Abbreviations = PPI

| CASNo = 9016-87-9

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| KEGG = C19571

| ChEBI = 82567

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| Formula = (C₈H₅NO)_n

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Polymethylene polyphenylene isocyanate (PPI), is a polyurea-based polymer derived from isocyanate monomers that is used in some glues, aerosol foams, plastics, paint and household products.{{cite web | url = https://www.whatsinproducts.com/chemicals/view/1/656/009016-87-9/Polymethylene%20polyphenyl%20isocyanate | title = Polymethylene polyphenyl isocyanate | work = Consumer Product Information Database }}

PPI is listed as a "hazardous agent" by the National Institutes of Health because it irritates skin and breathing passages at high concentrations. Some painters exposed to PPI and related isocyanate chemicals have developed occupational asthma.{{cite web | url = http://www.montereyherald.com/ci_7145319 | title=Judge orders moth spraying halted | website = montereyherald.com | url-status=dead | archive-url=https://web.archive.org/web/20071019001210/http://www.montereyherald.com/ci_7145319 | archive-date=2007-10-19 }} In chronic toxicity tests, mice exposed to low levels of PPI developed no side effects. Only those mice exposed to the two highest concentrations developed any lung symptoms.{{cite web | url = http://toxnet.nlm.nih.gov/cgi-bin/sis/search/f?./temp/~TBtYzA:2:tcat | website = toxnet.nlm.nih.gov |title=Wayback Machine has not archived that URL.}}{{Dead Link|date=September 2023}} The two highest doses used in this study were 1.0 and 6.0 mg per cubic meter for 6 hours each day, 5 days each week for 2 years. The duration-adjusted exposure levels for these two high concentrations are equivalent to 11 ppb and 70 ppb, 24 hours/day for two years.