PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Maleic anhydride 108-31-6 2215
14.01
4.01
11.01
14.02
4.08
7.01
11.00
4.09
4.06
4.10
Formula Synonyms
C4H2O3 MALEIC ANHYDRIDE, 2,5-FURANDIONE, 2,5-FURANEDIONE, ANHÍDRIDO MALÉICO (DOT SPANISH), ANHYDRIDE MALÉIQUE (DOT FRENCH), BM 10, CIS-BUTENEDIOIC ANHYDRIDE, CRYSTAL MAN, DIHYDRO-2,5-DIOXOFURAN, LYTRON 810, LYTRON 820, MALEIC ACID ANHYDRIDE, NCI-C54660, NOURYMIX MA 901, TOXILIC ANHYDRIDE
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
98.06 S 52.56 202 7.5 73.7 1.314 @ 60°C 14000
PAC Values
PAC Values (Original Units: ppm)
PAC-1 PAC-2 PAC-3
0.20 5.0 20
Converted PAC Values (mg/m3)
PAC-1 PAC-2 PAC-3
0.80 20 80
Technical Basis
A review of available sources identified exposure limits (ERPGs, IDLH, TWAs) and acute toxicity data (LD50) for several species and routes. Data sources were selected according to the hierarchy listed in Table 3.1. Toxicity data were selected according to type of exposure, species, and route according to the hierarchies stated in Sections 3.3.1, 3.3.2, and evaluated using factors in Tables 3.2, 3.3, and 3.4. The ERPGs were selected due to their priority among Protective Action Criteria (Section 1).
• PAC-1 = ERPG-1
• PAC-2 = ERGP-2
• PAC-3 = ERPG-3
This review generated PAC-3 and PAC-1 values consistent with Rev. 29A. The PAC sources and methodology remain consistent. Differences in the PAC-2 values may be due to updates in reported ERPG values.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/7923
https://cameochemicals.noaa.gov/chemical/3806
Exposure limits (ERPGs): https://www.osha.gov/chemicaldata/81
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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.