METHYL IODIDE†
Chemical Identification | |
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CAS # | 74-88-4 |
Formula |
CH₃I |
Synonyms |
iodomethane; monoiodomethane |
Physical Properties | |||
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Physical description | Colorless liquid with a pungent, ether-like odor. | ||
Boiling point | 109°F | Molecular weight | 141.94 |
Freezing point/melting point | -88°F | Vapor pressure | 400 mmHg |
Flash point | Vapor density | ||
Specific gravity | 2.28 | Ionization potential | 9.54 eV |
Lower explosive limit (LEL) | 10% | Upper explosive limit (UEL) | 15% |
NFPA health rating | 3 | NFPA fire rating | 0 |
NFPA reactivity rating | 0 | NFPA special instruction | |
Vapor hazard ratio (VHR) | |||
Historical exceedance percentage | |||
Target organs |
Monitoring Methods Used by OSHA | ||||||
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Analyte code (IMIS no.) | 1772 | |||||
Sampling group | ||||||
Sampler/Sampling media | CSC tube (100/50 mg) [SKC 226-01] | |||||
Sampling time* |
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Sampling volume (TWA)* | 15-50 L |
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Sampling flow rate (TWA)* | 0.01-1 L/min |
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Sampling volume (STEL/Peak/C)* |
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Sampling flow rate (STEL/Peak/C)* |
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Analytical method instruments | GC-FID | |||||
Method reference | NIOSH 1014 (partially validated) | |||||
Notes |
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Special requirements |
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* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.
Wipe Method | |
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Sampler/Sampling media |
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Bulk Method |
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On-Site Screening Techniques | ||||||
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Device | Infrared spectrophotometer | Detector tube | ||||
Model/Type | Miran 1A & 1B | Matheson-Kitagawa 8014-176S | ||||
Sampling information (see manufacturer instructions) |
1.8 ppm@3.4µm | 5-40 ppm range |
Exposure Limits | |||||||
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OSHA PEL
8-hour TWA (ST) STEL (C) Ceiling Peak |
NIOSH REL
Up to 10-hour TWA (ST) STEL (C) Ceiling |
ACGIH TLV©
8-hour TWA (ST) STEL (C) Ceiling |
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PEL-TWA |
5 ppm (28 mg/m³) |
REL-TWA |
2 ppm (10 mg/m³) |
TLV-TWA |
2 ppm [1978] |
PEL-TWA |
2 ppm (10 mg/m³) |
PEL-STEL |
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REL-STEL |
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TLV-STEL |
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PEL-STEL |
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PEL-C |
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REL-C |
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TLV-C |
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PEL-C |
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Skin notation |
Y |
Skin notation |
Y |
Skin notation |
Y |
Skin notation |
Y |
Notes: |
Notes:
CARCINOGEN (Ca): REDUCE EXPOSURE TO LOWEST FEASIBLE CONCENTRATION (LOQ 1.7 ppm). See Appendix A, NIOSH Potential Occupational Carcinogens. |
Notes:
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Notes:
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Health factors: See NIH-NLM PubChem. | IDLH |
100 ppm |
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Carcinogenic classifications: IARC-3, NIOSH-Ca |
Notes:
Ca |
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AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
25 ppm/50 ppm/125 ppm |
Additional Resources and Literature References |
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NOAA: CAMEO Chemicals - Methyl iodide NIOSH: Pocket Guide to Chemical Hazards - Methyl iodide Literature References
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Last Updated Date : 01/29/2021