二苯基甲烷二異氰酸酯

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| Verifiedfields = changed
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| verifiedrevid = 486591748
| Name = 4,4'-Methylene diphenyl diisocyanate
| ImageFile = 4,4'-methylene diphenyl diisocyanate.svg
| ImageFile2 = Methylene-diphenyl-diisocyanate-3D-vdW.png
| ImageName = 4,4'-methylene diphenyl diisocyanate
| PIN = 1,1'-Methylenebis(4-isocyanatobenzene)
| OtherNames =
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| LD50 = 2200 mg/kg (mouse, oral)。這種異構體也被稱為純MDI。 MDI與多元醇在聚氨酯的生產中發生反應。 它是二異氰酸酯產量最高的，在2000年佔全球市場的61.3％。

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