MESITYL OXIDE†
Chemical Identification | |
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CAS # | 141-79-7 |
Formula |
C₆H₁₀O |
Synonyms |
isobutenyl methyl ketone; isopropylideneacetone; methyl isobutenyl ketone; 4-methyl-3-penten-2-one |
Physical Properties | |||
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Physical description | Oily, colorless to light-yellow liquid with a peppermint- or honey-like odor. | ||
Boiling point | 266°F | Molecular weight | 98.2 |
Freezing point/melting point | -52°F | Vapor pressure | 9 mmHg |
Flash point | 87°F | Vapor density | |
Specific gravity | 0.853 at 68°F | Ionization potential | 9.08 eV |
Lower explosive limit (LEL) | 1.4% | Upper explosive limit (UEL) | 7.2% |
NFPA health rating | 3 | NFPA fire rating | 3 |
NFPA reactivity rating | 1 | 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.) | 1635 | |||||
Sampling group | ||||||
Sampler/Sampling media | CSC tube (100/50 mg) [SKC 226-01] | |||||
Sampling time* | ||||||
Sampling volume (TWA)* | 1-25 L |
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Sampling flow rate (TWA)* | 0.01-0.2 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 1301 (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 | Infrared spectrophotometer | ||||
Model/Type | Matheson-Kitagawa 8014-190U | Miran 1A & 1B | ||||
Sampling information (see manufacturer instructions) |
5-100 ppm range | 0.8 ppm@8.2 µm |
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 |
25 ppm (100 mg/m³) |
REL-TWA |
10 ppm (40 mg/m³) |
TLV-TWA |
15 ppm [1992] |
PEL-TWA |
15 ppm (60 mg/m³) |
PEL-STEL |
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REL-STEL |
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TLV-STEL |
25 ppm [1992] |
PEL-STEL |
25 ppm (100 mg/m³) |
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 |
N |
Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
Notes: |
Notes:
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Notes:
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Notes:
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Health factors: See NIH-NLM PubChem. | IDLH |
1400 ppm |
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Carcinogenic classifications: Not listed |
Notes:
10 % of LEL |
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AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
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Additional Resources and Literature References |
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NOAA: CAMEO Chemicals - Mesityl oxide NIOSH: Pocket Guide to Chemical Hazards - Mesityl oxide Literature References
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Last Updated Date : 01/04/2021