METHYL ACETYLENE-PROPADIENE MIXTURE (MAPP)†
| Chemical Identification | |
|---|---|
| CAS # | 59355-75-8 |
| Formula |
C₃H₄ |
| Synonyms |
MAPP gas; methyl acetylene-allene mixture; propadiene-methyl acetylene; propyne-allene mixture; propyne-propadiene mixture |
| Physical Properties | |||
|---|---|---|---|
| Physical description | Colorless gas with a strong, characteristic, foul odor. | ||
| Boiling point | -36 to -4°F | Molecular weight | 40.1 |
| Freezing point/melting point | -213°F | Vapor pressure | >1 atm |
| Flash point | Vapor density | 1.48 | |
| Specific gravity | 0.576 at 59°F | Ionization potential | |
| Lower explosive limit (LEL) | 3.4% | Upper explosive limit (UEL) | 10.8% |
| NFPA health rating | NFPA fire rating | ||
| NFPA reactivity rating | NFPA special instruction | ||
| Vapor hazard ratio (VHR) | |||
| Historical exceedance percentage | |||
| Target organs | |||
| Monitoring Methods Used by OSHA | ||||||
|---|---|---|---|---|---|---|
| Analyte code (IMIS no.) | 1652 | |||||
| Sampling group | ||||||
| Sampler/Sampling media | ||||||
| Sampling time* | ||||||
| Sampling volume (TWA)* | ||||||
| Sampling flow rate (TWA)* | ||||||
| Sampling volume (STEL/Peak/C)* |
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| Sampling flow rate (STEL/Peak/C)* |
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| Analytical method instruments | ||||||
| Method reference | ||||||
| Notes |
OSHA staff, please contact the SLTC before sampling (801) 233-4900. |
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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 | |
|---|---|
| Sampler/Sampling media |
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| Bulk Method |
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| On-Site Screening Techniques | ||||||
|---|---|---|---|---|---|---|
| Device | ||||||
| Model/Type | ||||||
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Sampling information (see manufacturer instructions) |
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| 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 |
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| PEL-TWA |
1000 ppm (1800 mg/m³) |
REL-TWA |
1000 ppm (1800 mg/m³) |
TLV-TWA |
1000 ppm [1964] |
PEL-TWA |
1000 ppm (1800 mg/m³) |
| PEL-STEL |
|
REL-STEL |
1250 ppm (2250 mg/m³) |
TLV-STEL |
1250 ppm [1964] |
PEL-STEL |
1250 ppm (2250 mg/m³) |
| 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:
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| Health factors: See NIH-NLM PubChem. | IDLH |
3400 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 - Methylacetylene and propadiene mixture, stabilized NIOSH: Pocket Guide to Chemical Hazards - Methyl acetylene-propadiene mixture Literature References
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Last Updated Date : 01/28/2021