Names | |
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Preferred IUPAC name
1,1′-Methylenebis(4-isocyanatobenzene) | |
Other names
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Identifiers | |
3D model (JSmol)
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ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.043.361 |
EC Number |
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PubChem CID
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RTECS number |
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UNII | |
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Properties | |
C15H10N2O2 | |
Molar mass | 250.25 g/mol |
Appearance | White or pale yellow solid |
Density | 1.230 g/cm3, solid |
Melting point | 40 °C (104 °F; 313 K) |
Boiling point | 314 °C (597 °F; 587 K) |
Reacts | |
Vapor pressure | 0.000005 mmHg (20 °C)[1] |
Hazards | |
GHS labelling: | |
Danger | |
H315, H317, H319, H332, H334, H335, H351, H373 | |
P201, P202, P260, P261, P264, P271, P272, P280, P281, P285, P302+P352, P304+P312, P304+P340, P304+P341, P305+P351+P338, P308+P313, P312, P314, P321, P332+P313, P333+P313, P337+P313, P342+P311, P362, P363, P403+P233, P405, P501 | |
Flash point | 212–214 °C (Cleveland open cup) |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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2200 mg/kg (mouse, oral)[2] |
LDLo (lowest published)
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31,690 mg/kg (rat, oral)[2] |
LC50 (median concentration)
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NIOSH (US health exposure limits): | |
PEL (Permissible)
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C 0.2 mg/m3 (0.02 ppm)[1] |
REL (Recommended)
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TWA 0.05 mg/m3 (0.005 ppm) C 0.2 mg/m3 (0.020 ppm) [10-minute][1] |
IDLH (Immediate danger)
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75 mg/m3[1] |
Related compounds | |
Related Isocyanates
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Related compounds
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Polyurethane |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Methylene diphenyl diisocyanate (MDI) is an aromatic diisocyanate. Three isomers are common, varying by the positions of the isocyanate groups around the rings: 2,2′-MDI, 2,4′-MDI, and 4,4′-MDI. The 4,4′ isomer is most widely used, and is also known as 4,4′-diphenylmethane diisocyanate.[3] This isomer is also known as Pure MDI. MDI reacts with polyols in the manufacture of polyurethane. It is the most produced diisocyanate, accounting for 61.3% of the global market in the year 2000.[4]