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Methylene bisphenyl isocyanate |
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Synonyms & Trade Names4,4'-Diphenylmethane diisocyanate; MDI; Methylene bis(4-phenyl isocyanate); Methylene di-p-phenylene ester of isocyanic acid |
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CAS No.101-68-8 |
RTECS No.NQ9350000 |
DOT ID & Guide |
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FormulaCH2(C6H4NCO)2 |
Conversion1 ppm = 10.24 mg/m3 |
IDLH75 mg/m3See: 101688 |
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Exposure LimitsNIOSH 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) |
Measurement MethodsNIOSH 5521 , 5522 , 5525; OSHA 18 See: NMAM or OSHA Methods |
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Physical DescriptionWhite 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% |
VP(77°F): 0.000005 mmHg | IP:? |
Sp.Gr:1.23 (Solid at 77°F) 1.19 (Liquid at 122°F) |
Fl.P:390°F |
UEL:? |
LEL:? |
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Combustible Solid | |||||
Incompatibilities & ReactivitiesStrong alkalis, acids, alcohol [Note: Polymerizes at 450°F.] |
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Exposure Routesinhalation, ingestion, skin and/or eye contact |
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Symptomsirritation eyes, nose, throat; resp sensitization; cough, pulmonary secretions, chest pain, dyspnea (breathing difficulty); asthma |
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Target OrgansEyes, respiratory system |
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Personal Protection/Sanitation(See protection codes)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: Up to 1.25 mg/m3: Up to 2.5 mg/m3: Up to 75 mg/m3: Emergency or planned entry into unknown concentrations or IDLH conditions: Escape: |
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See also: INTRODUCTION See ICSC CARD: 0298 See MEDICAL TESTS: 0147 |
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