Label abbreviations descriptions

METHYL ACRYLONITRILE

Chemical Identification
CAS # 126-98-7
Formula

C₄H₅N
Synonyms
 

2-cyanopropene-1, 2-cyano-1-propene; isoprene cyanide; isopropenylnitrile; methacrylonitrile; à-methylacrylonitrile; 2-methylpropenenitrile

Physical Properties
Physical description Colorless liquid with an odor like bitter almonds.
Boiling point 195°F Molecular weight 67.1
Freezing point/melting point -32.4°F Vapor pressure 71 mmHg at 77°F
Flash point 55°F Vapor density 2.31
Specific gravity 0.8001 Ionization potential
Lower explosive limit (LEL) 2% Upper explosive limit (UEL) 6.8%
NFPA health rating 4 NFPA fire rating 3
NFPA reactivity rating 2 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.

Bulk/Wipe Method
Wipe Sampler/Sampling media
 

 
Bulk Method
 

 

On-Site Screening Techniques
Device Detector tube Detector tube
Model/Type Dräger 6730301 Gastec 192
Sampling information
(see manufacturer instructions) 		1-10 ppm range 0.2-32.0 ppm range

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
 

 

 REL-TWA
 

1 ppm (3 mg/m³)

 TLV-TWA
 

1 ppm [2010]

 PEL-TWA
 

1 ppm (3 mg/m³)
PEL-STEL
 

 

 REL-STEL
 

 

 TLV-STEL
 

 

 PEL-STEL
 

 
PEL-C
 

 

 REL-C
 

 

 TLV-C
 

 

 PEL-C
 

 
Skin notation
 

NA

 Skin notation
 

Y

 Skin notation
 

Y

 Skin notation
 

Y
Notes:
 

Not established

 Notes:
 

 

 Notes:
 

 

 Notes:
 

 
Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: TLV-A4 Notes:
 

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

 

Additional Resources and Literature References

Last Updated Date : 01/28/2021