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| Methylene bisphenyl isocyanate | CAS 101-68-8 | ||
| CH2(C6H4NCO)2 | RTECS NQ9350000 | ||
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Synonyms & Trade Names 4,4'-Diphenylmethane diisocyanate; MDI; Methylene bis(4-phenyl isocyanate); Methylene di-p-phenylene ester of isocyanic acid |
DOT ID & Guide 2489 156 |
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Exposure Limits |
NIOSH REL: TWA 0.05 mg/m3 (0.005 ppm) C 0.2 mg/m3 (0.020 ppm) [10-minute] | ||
| OSHA PEL: C 0.2 mg/m3 (0.02 ppm) | |||
| IDLH 75 mg/m3 | Conversion 1 ppm = 10.24 mg/m3 | ||
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Physical Description White to light-yellow, odorless flakes. [Note: A liquid above 99°F.] |
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MW: 250.3 |
BP: 597°F |
MLT: 99°F |
Sol: 0.2% |
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VP(77°F): 0.000005 mmHg |
IP: ? |
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Sp.Gr: 1.23 (Solid at 77°F) 1.19 (Liquid at 122°F) |
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Fl.P: 390°F |
UEL: ? |
LEL: ? |
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| Combustible Solid | |||
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Incompatibilities & Reactivities Strong alkalis, acids, alcohol [Note: Polymerizes at 450°F.] |
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Measurement Methods NIOSH 5521, 5522; OSHA 18 |
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Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: Daily |
First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash immediately Breathing: Respiratory support Swallow: Medical attention immediately |
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Respirator Recommendations
NIOSH Up to 0.5 mg/m3: (APF = 10) Any supplied-air respirator* Up to 1.25 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode* Up to 2.5 mg/m3: (APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Up to 75 mg/m3: (APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode Emergency or planned entry into unknown concentrations or IDLH conditions: (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode/(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus Escape: (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus |
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| Exposure Routes inhalation, ingestion, skin and/or eye contact | |
| Symptoms Irritation eyes, nose, throat; respiratory sensitization; cough, pulmonary secretions, chest pain, dyspnea (breathing difficulty); asthma | |
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Target Organs
Eyes, respiratory system |
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| See also: INTRODUCTION |