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| Methyl isocyanate | CAS 624-83-9 | ||
| CH3NCO | RTECS NQ9450000 | ||
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Synonyms & Trade Names Methyl ester of isocyanic acid, MIC |
DOT ID & Guide 2480 155 |
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Exposure Limits |
NIOSH REL: TWA 0.02 ppm (0.05 mg/m3) [skin] | ||
| OSHA PEL: TWA 0.02 ppm (0.05 mg/m3) [skin] | |||
| IDLH 3 ppm | 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 |
BP: 139°F |
FRZ: -49°F |
Sol(59°F): 10% |
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VP: 348 mmHg |
IP: 10.67 eV |
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Sp.Gr: 0.96 |
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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. | |||
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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 |
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Personal Protection & Sanitation 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 |
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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 |
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| Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact | |
| 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 |