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         1. NIOSH Pocket Guide to Chemical Hazards
      Methyl iodide
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        Methyl iodide
            Related Pages
                Synonyms & Trade Names
                  Iodomethane, Monoiodomethane
                CAS No.
                  74-88-4
                RTECS No.
                  PA9450000
                DOT ID & Guide
                  2644 151
                Formula
                  CH₃I
                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.]
                Molecular Weight
                  141.9
                Boiling Point
                  109°F
                Freezing Point
                  -88°F
                Solubility
                  1%
                Vapor Pressure
                  400 mmHg
                Ionization Potential
                  9.54 eV
                Specific Gravity
                  2.28
                Flash Point
                  NA
                Upper Explosive Limit
                  NA
                Lower Explosive Limit
                  NA
                  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 ICSC CARD: 0509
      Page last reviewed: October 30, 2019
        Content source: National Institute for Occupational Safety and Health
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