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| Methyl iodide | CAS 74-88-4 | ||
| CH3I | RTECS PA9450000 | ||
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Synonyms & Trade Names Iodomethane, Monoiodomethane |
DOT ID & Guide 2644 151 |
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Exposure Limits |
NIOSH REL: Ca TWA 2 ppm (10 mg/m3) [skin] See Appendix A | ||
| OSHA PEL: TWA 5 ppm (28 mg/m3) [skin] | |||
| IDLH Ca [100 ppm] | Conversion 1 ppm = 5.80 mg/m3 | ||
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Physical Description Colorless liquid with a pungent, ether-like odor. [Note: Turns yellow, red, or brown on exposure to light & moisture.] |
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MW: 141.9 |
BP: 109°F |
FRZ: -88°F |
Sol: 1% |
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VP: 400 mmHg |
IP: 9.54 eV |
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Sp.Gr: 2.28 |
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Fl.P: NA |
UEL: NA |
LEL: NA |
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| Noncombustible Liquid | |||
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Incompatibilities & Reactivities Strong oxidizers [Note: Decomposes at 518°F.] |
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Measurement Methods NIOSH 1014 |
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Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: No recommendation Provide: Eyewash, Quick drench |
First Aid (See procedures) Eye: Irrigate immediately Skin: Soap flush immediately Breathing: Respiratory support Swallow: Medical attention immediately |
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Respirator Recommendations
NIOSH At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration: (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, respiratory system; nausea, vomiting; dizziness, ataxia; slurred speech, drowsiness; dermatitis; [potential occupational carcinogen] | |
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Target Organs
Eyes, skin, respiratory system, central nervous system Cancer Site [in animals: lung, kidney & forestomach tumors] |
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| See also: INTRODUCTION |