Chemical Safety Program: PACs for Chemicals of Concern

PAC Database - Detailed Chemical Data

Chemical Identity

Chemical	CAS#	UN#	Health Code Numbers
Methacrylonitrile; (Methylacrylonitrile)	126-98-7	3079	14.01 14.02 7.01 4.05 11.00 4.02 7.00 4.10 4.06 4.07
Formula	Synonyms
C4H5N	METHACRYLONITRILE, INHIBITED, 1-METHYLETHENYL CYANIDE, 2-CYANO-1-PROPENE, 2-CYANOPROPENE, 2-CYANOPROPENE-1, 2-METHYL-2- PROPENENITRILE, 2-METHYL-2-PROPENENITRILE, 2-METHYLACRYLONITRILE, 2-METHYLPROPENENITRILE, 2-PROPENE- NITRILE, 2-METHYL-, 2-PROPENENITRILE, 2-METHYL, 2-PROPENENITRILE, 2-METHYL-, ALPHA-METHACRYLONITRILE, ALPHA-METHYLACRYLONITRILE, ISOPRENE CYANIDE, ISOPROPENE CYANIDE, ISOPROPENYLNITRILE, MAN, METACRILONITRILO, INHIBIDO (DOT SPANISH), METHACRYLNITRILE, METHACRYLONITRILE, MÉTHACRYLONITRILE, STABILISÉ (DOT FRENCH), METHYLACRYLONITRILE, RCRA WASTE NUMBER U152, USAF ST-40, USAF ST40

Physical Properties

Mol Wt	State	MP (°C)	BP (°C)	VP (Hg)	VP (°C)	SG	LEL (ppm)
67.1	L	-36	90.3	71.2	25	0.805 @ 20°C	20000

PAC Values

PAC Values (Original Units: ppm)
PAC-1	PAC-2	PAC-3
0.091	1.0	3.1

Converted PAC Values (mg/m3)
PAC-1	PAC-2	PAC-3
0.25	2.7	8.5

Technical Basis

A review of available sources identified exposure limits for this chemical including an AEGL-2 and AEGL-3. The AEGLs were selected as the TEEL-2 and TEEL-3 due to their priority among the emergency exposure limits (Section 1). Due to insufficient data, an AEGL-1 does not exist for this chemical; therefore, the TEEL-1 value was derived according to Table 3.5.
• TEEL-1 = TEEL-2/11
• TEEL-2 = AEGL-2
• TEEL-3 = AEGL-3
This review generated TEEL values consistent with Rev. 29A*.

References

Chemical information: Retrieved from Table 3-2 of the EPA Technical Support Document. https://www.epa.gov/aegl/methacrylonitrile-results-aegl-program

AEGLs: https://www.epa.gov/aegl/methacrylonitrile-results-aegl-program

Other exposure limits: https://www.osha.gov/chemicaldata/187

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PAC values marked with a subscript "A" correspond to 60-minute AEGL values.
PAC values marked with a subscript "E" correspond to ERPG values.
PAC values marked by * are >= 10% lower explosive limit (LEL) but < 50% LEL.
PAC values marked by ** are > 50% LEL but < 100% LEL.
PAC values marked by *** are >= LEL.