METHYL ACETYLENE (PROPYNE)†
| Chemical Identification | |
|---|---|
| CAS # | 74-99-7 |
| Formula |
C₃H₄ |
| Synonyms |
allylene; propine; propyne; 1-propyne |
| Physical Properties | |||
|---|---|---|---|
| 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 | ||||||
|---|---|---|---|---|---|---|
| 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 | |
|---|---|
| Sampler/Sampling media |
|
| Bulk Method |
|---|
| On-Site Screening Techniques | ||||||
|---|---|---|---|---|---|---|
| Device | Infrared spectrophotometer | |||||
| Model/Type | Miran 1A & 1B | |||||
|
Sampling information (see manufacturer instructions) |
2.8 ppm@3.0 µm | |||||
| Exposure Limits | |||||||
|---|---|---|---|---|---|---|---|
|
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 |
|||||
| 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 |
|
TLV-STEL |
|
PEL-STEL |
|
|
| PEL-C |
|
REL-C |
|
TLV-C |
|
PEL-C |
|
| Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
| Notes: |
Notes:
|
Notes:
(EX) explosion hazard: the substance is a flammable asphyxiant or excursions above the TLV could approach 10% of the lower explosive limit. |
Notes:
|
||||
| Health factors: See NIH-NLM PubChem. | IDLH |
1700 ppm |
|||||
| 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 |
|---|
|
NOAA: CAMEO Chemicals - 1-Propyne NIOSH: Pocket Guide to Chemical Hazards - Methyl acetylene Literature References
|
Last Updated Date : 01/05/2021