Methylene bisphenyl isocyanate
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CAS
101-68-8
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CH2(C6H4NCO)2
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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
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DOT ID & Guide
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Exposure
Limits
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NIOSH REL: TWA 0.05 mg/m3 (0.005 ppm) C 0.2 mg/m3 (0.020 ppm) [10-minute]
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OSHA PEL: C 0.2 mg/m3 (0.02 ppm)
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IDLH
75 mg/m3
See: 101688
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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
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BP: 597°F
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MLT: 99°F
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Sol: 0.2%
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VP(77°F): 0.000005 mmHg
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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
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UEL: ?
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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, 5525; OSHA 18
See: NMAM or OSHA Methods
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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
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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 an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
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Exposure Routes
inhalation, ingestion, skin and/or eye contact
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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
See ICSC CARD: 0298 See MEDICAL TESTS: 0147
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