METHYL CHLORIDE†
Chemical Identification | |
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CAS # | 74-87-3 |
Formula |
CH₃Cl |
Synonyms |
chloromethane; monochloromethane |
Physical Properties | |||
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Physical description | Colorless gas with a faint, sweet odor which is not noticeable at dangerous concentrations. | ||
Boiling point | -12°F | Molecular weight | 50.5 |
Freezing point/melting point | -144°F | Vapor pressure | 5.0 atm |
Flash point | -49.0°F | Vapor density | 1.78 |
Specific gravity | 0.997 at -11.2°F | Ionization potential | 11.28 eV |
Lower explosive limit (LEL) | 8.1% | Upper explosive limit (UEL) | 17.4% |
NFPA health rating | 2 | NFPA fire rating | 4 |
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.) | 1710 | |||||
Sampling group | ||||||
Sampler/Sampling media | 2 CSC tubes in series (first tube 400/200 mg, second tube 100/50 mg) [SKC 226-09 & SKC 226-01] | |||||
Sampling time* |
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Sampling volume (TWA)* | 0.4-3 L |
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Sampling flow rate (TWA)* | 0.01-0.1 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 1001 (fully 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 | Detector tube | Detector tube | ||||
Model/Type | Gastec 51 | Gastec 51L | ||||
Sampling information (see manufacturer instructions) |
1 stroke, approx 10-480 ppm | 1 or 2 strokes, approx 1-86 ppm |
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 |
100 ppm (210 mg/m³) |
REL-TWA |
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TLV-TWA |
50 ppm [1992] |
PEL-TWA |
50 ppm (105 mg/m³) |
PEL-STEL |
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REL-STEL |
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TLV-STEL |
100 ppm [1992] |
PEL-STEL |
100 ppm (210 mg/m³) |
PEL-C |
200 ppm; 300 ppm (Peak - 5 min in any 3 hrs) |
REL-C |
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TLV-C |
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PEL-C |
300 ppm |
Skin notation |
N |
Skin notation |
N |
Skin notation |
Y |
Skin notation |
N |
Notes:
Ceiling value applies only to OSHA General Industry standard. TWA applies to OSHA's General Industry and Maritime standards. See 29 CFR 1910.1000 Table Z-2 and 29 CFR 1915.1000 Table Z-Shipyards. |
Notes:
CARCINOGEN (Ca): REDUCE EXPOSURE TO LOWEST FEASIBLE CONCENTRATION (LOQ 1.6 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 |
2000 ppm |
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Carcinogenic classifications: IARC-3, NIOSH-Ca, TLV-A4, EPA-D; CBD |
Notes:
Ca |
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AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
150 ppm/1000 ppm/3000 ppm |
Additional Resources and Literature References |
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NOAA: CAMEO Chemicals - Methyl chloride NIOSH: Pocket Guide to Chemical Hazards - Methyl chloride Literature References
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Last Updated Date : 01/29/2021