Methyl isocyanate
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CAS
624-83-9
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CH3NCO
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RTECS
NQ9450000
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Synonyms & Trade Names
Methyl ester of isocyanic acid, MIC
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DOT ID & Guide
2480 155
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Exposure
Limits
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NIOSH REL: TWA 0.02 ppm (0.05 mg/m3) [skin]
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OSHA PEL: TWA 0.02 ppm (0.05 mg/m3) [skin]
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IDLH
3 ppm
See: 624839
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Conversion
1 ppm = 2.34 mg/m3
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Physical Description
Colorless liquid with a sharp, pungent odor.
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MW: 57.1
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BP: 102-104°F
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FRZ: -49°F
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Sol(59°F): 10%
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VP: 348 mmHg
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IP: 10.67 eV
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Sp.Gr: 0.96
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Fl.P: 19°F
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UEL: 26%
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LEL: 5.3%
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Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
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Incompatibilities & Reactivities
Water, oxidizers, acids, alkalis, amines, iron, tin, copper [Note: Usually contains inhibitors to prevent polymerization.]
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Measurement Methods
OSHA 54
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 (flammable)
Change: No recommendation
Provide: Eyewash, Quick drench
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First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
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Respirator Recommendations
NIOSH/OSHA
Up to 0.2 ppm:
(APF = 10) Any supplied-air respirator*
Up to 0.5 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode*
Up to 1 ppm:
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece
Up to 3 ppm:
(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/Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
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Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
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Symptoms
Irritation eyes, skin, nose, throat; respiratory sensitization, cough, pulmonary secretions, chest pain, dyspnea (breathing difficulty); asthma; eye, skin damage; in animals: pulmonary edema
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Target Organs
Eyes, skin, respiratory system
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See also: INTRODUCTION
See ICSC CARD: 0004 See MEDICAL TESTS: 0143
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