METHYL ACETYLENE (PROPYNE)†
Chemical Identification | |
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CAS # | 74-99-7 |
Formula |
C₃H₄ |
Synonyms |
allylene; propine; propyne; 1-propyne |
Physical Properties | |||
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Physical description | Colorless gas with a sweet odor. | ||
Boiling point | -10°F | Molecular weight | 40.1 |
Freezing point/melting point | -153°F | Vapor pressure | 5.2 atm |
Flash point | Vapor density | 1.41 | |
Specific gravity | Ionization potential | 10.36 eV | |
Lower explosive limit (LEL) | 1.7% | Upper explosive limit (UEL) | |
NFPA health rating | 1 | NFPA fire rating | 4 |
NFPA reactivity rating | 3 | 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.) | ||||||
Sampling group | ||||||
Sampler/Sampling media | ||||||
Sampling time* | ||||||
Sampling volume (TWA)* | ||||||
Sampling flow rate (TWA)* | ||||||
Sampling volume (STEL/Peak/C)* | ||||||
Sampling flow rate (STEL/Peak/C)* | ||||||
Analytical method instruments | ||||||
Method reference | ||||||
Notes | ||||||
Special requirements |
* 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 | |||||
Model/Type | Miran 1A & 1B | |||||
Sampling information (see manufacturer instructions) |
2.8 ppm@3.0 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 |
1000 ppm (1650 mg/m³) |
REL-TWA |
1000 ppm (1650 mg/m³) |
TLV-TWA |
1000 ppm (EX) [1956] |
PEL-TWA |
1000 ppm (1650 mg/m³) |
PEL-STEL | 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 |
N |
Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
Notes: |
Notes:
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Notes:
(EX) explosion hazard: the substance is a flammable asphyxiant or excursions above the TLV could approach 10% of the lower explosive limit. |
Notes:
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Health factors: See NIH-NLM PubChem. | IDLH |
1700 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 - 1-Propyne NIOSH: Pocket Guide to Chemical Hazards - Methyl acetylene Literature References
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Last Updated Date : 01/05/2021