Methyl iodide
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CAS
74-88-4
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CH3I
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RTECS
PA9450000
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Synonyms & Trade Names
Iodomethane, Monoiodomethane
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DOT ID & Guide
2644 151
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Exposure
Limits
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NIOSH REL: Ca TWA 2 ppm (10 mg/m3) [skin] See Appendix A
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OSHA PEL: TWA 5 ppm (28 mg/m3) [skin]
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IDLH
Ca [100 ppm]
See: 74884
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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
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BP: 109°F
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FRZ: -88°F
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Sol: 1%
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VP: 400 mmHg
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IP: 9.54 eV
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Sp.Gr: 2.28
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Fl.P: NA
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UEL: NA
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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
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 or contaminated
Change: No recommendation
Provide: Eyewash, Quick drench
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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
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, 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 See ICSC CARD: 0509
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