Jump to: navigation, s Methylene diphenyl diisocyanate, most often abbreviated as MDI, is an aromatic diisocyanate. It exists in three isomers, 2,2'-MDI, 2,4'-MDI, and 4,4'-MDI. The 4,4' isomer is most practically useful, and is also known as Pure MDI. MDI is reacted with a polyol in the manufacture of polyurethane. It is the most produced diisocyanate, accounting for 61.3% of the global market in the year 2000.[1] earch

{| ! style="background: rgb(248, 234, 186) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial" colspan="2" | 4,4'-methylene diphenyl diisocyanate |} IUPAC name 1-isocyanato-4-

[(4-isocyanatophenyl)methyl]

benzene Other names Pure MDI

4,4'-methylene diphenyl

diisocyanate

4,4'-diphenylmethane

diisocyanate {| ! style="background: rgb(248, 234, 186) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial" colspan="2" | Identifiers |} CAS number 101-68-8 RTECS number NQ9350000 SMILES O=C=NC(C=C2)=CC=C2C

C1=CC=C(N=C=O)C=C1 {| ! style="background: rgb(248, 234, 186) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial" colspan="2" | Properties |} Molecular formula C15H10N2O2 Molar mass 250.25 g/mol Appearance white or pale yellow solid Density 1.230 g/cm3, solid Melting point 40 Â°C (313 K) Boiling point 314 Â°C (587 K) Solubility in water Reacts {| ! style="background: rgb(248, 234, 186) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial" colspan="2" | Hazards |} EU classification Harmful (Xn) R-phrases R20, R36/37/38, R42/43 S-phrases (S1/2), S23, S36/37, S45 Flash point 212-214 Â°C (Cleveland open cup) {| ! style="background: rgb(248, 234, 186) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial" colspan="2" | Related Compounds |} Related Isocyanates Toluene diisocyanate

Naphthalene diisocyanate Related compounds Polyurethane Except where noted otherwise, data are given for

materials in their standard state

(at 25 Â°C, 100 kPa)

Infobox disclaimer and references Methylene diphenyl diisocyanate, most often abbreviated as MDI, is an aromatic diisocyanate. It exists in three isomers, 2,2'-MDI, 2,4'-MDI, and 4,4'-MDI. The 4,4' isomer is most practically useful, and is also known as Pure MDI. MDI is reacted with a polyol in the manufacture of polyurethane. It is the most produced diisocyanate, accounting for 61.3% of the global market in the year 2000.[1]

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