METHYL ACETYLENE-PROPADIENE MIXTURE (MAPP)†

Chemical Identification
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 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
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)*
 

 

Sampling flow rate (STEL/Peak/C)*
 

 

Analytical method instruments
Method reference
Notes
 

OSHA staff, please contact the SLTC before sampling (801) 233-4900.

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
Wipe Method
Sampler/Sampling media
 

 

Bulk Method
Bulk Method
 

 

On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
Exposure Limits
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
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
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:
 

See 29 CFR 1910.1000 Table Z-1.

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
 

3400 ppm

Carcinogenic classifications: Not listed Notes:
 

10% of LEL

AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 

 

Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Methylacetylene and propadiene mixture, stabilized

NIOSH: Pocket Guide to Chemical Hazards - Methyl acetylene-propadiene mixture

Literature References

 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Methylacetylene-propadiene mixture. See annual publication for most recent information.

Last Updated Date : 01/28/2021