Methyl iodide |
Synonyms & Trade Names Iodomethane, Monoiodomethane |
CAS No. 74-88-4 |
RTECS No. PA9450000 |
DOT ID & Guide 2644 151 |
FormulaCH3I |
Conversion 1 ppm = 5.80 mg/m3 |
IDLH Ca [100 ppm]
See: 74884 |
Exposure Limits NIOSH REL: Ca TWA 2 ppm (10 mg/m3) [skin] See Appendix A
OSHA PEL: TWA 5 ppm (28 mg/m3) [skin] |
Measurement Methods
NIOSH 1014
See: NMAM or OSHA Methods |
Physical Description Colorless liquid with a pungent, ether-like odor. [Note: Turns yellow, red, or brown on exposure to light & moisture.] |
MW: 141.9 |
BP: 109°F |
FRZ: -88°F |
Sol: 1% |
VP: 400 mmHg |
IP: 9.54 eV |
Sp.Gr: 2.28 |
Fl.P: NA |
UEL: NA |
LEL: NA |
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| Noncombustible Liquid |
Incompatibilities & Reactivities Strong oxidizers [Note: Decomposes at 518°F.] |
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] |
Target Organs Eyes, skin, respiratory system, central nervous system |
Cancer Site[in animals: lung, kidney & forestomach tumors] |
Personal Protection/Sanitation (See protection codes)
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 |
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
Important additional information about respirator selection |
| See also: INTRODUCTION See ICSC CARD: 0509
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