Methyl isocyanate |
Synonyms & Trade Names Methyl ester of isocyanic acid, MIC |
CAS No. 624-83-9 |
RTECS No. NQ9450000 |
DOT ID & Guide 2480 155 |
FormulaCH3NCO |
Conversion 1 ppm = 2.34 mg/m3 |
IDLH 3 ppm
See: 624839 |
Exposure Limits NIOSH REL: TWA 0.02 ppm (0.05 mg/m3) [skin]
OSHA PEL: TWA 0.02 ppm (0.05 mg/m3) [skin] |
Measurement Methods
OSHA 54
See: NMAM or OSHA Methods |
Physical Description Colorless liquid with a sharp, pungent odor. |
MW: 57.1 |
BP: 102-104°F |
FRZ: -49°F |
Sol(59°F): 10% |
VP: 348 mmHg |
IP: 10.67 eV |
Sp.Gr: 0.96 |
Fl.P: 19°F |
UEL: 26% |
LEL: 5.3% |
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| Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F. |
Incompatibilities & Reactivities Water, oxidizers, acids, alkalis, amines, iron, tin, copper [Note: Usually contains inhibitors to prevent polymerization.] |
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact |
Symptoms irritation eyes, skin, nose, throat; resp sensitization, cough, pulmonary secretions, chest pain, dyspnea (breathing difficulty); asthma; eye, skin damage; in animals: pulmonary edema |
Target Organs Eyes, skin, 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 (flammable)
Change: No recommendation
Provide: Eyewash, Quick drench |
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately |
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 |
| See also: INTRODUCTION See ICSC CARD: 0004 See MEDICAL TESTS: 0143 |
