PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Benzidine | 92-87-5 | 1885 |
15.02
4.09
4.10
4.07
4.03
1.01
1.02
3.09
3.02
3.10
|
|||||||||
| Formula | Synonyms | |||||||||||
| C12H12N2 | BENZIDINE, (1,1^-BIPHENYL)-4,4'-DIAMINE, 1,1'-BIPHENYL-4,4'-DIAMINE, 4,4'-BIANILINE, 4,4'-BIPHENYLDIAMINE, 4,4'-BIPHENYLENEDIAMINE, 4,4'-DIAMINO-1,1'-BIPHENYL, 4,4'-DIAMINOBIPHENYL, 4,4'-DIAMINODIPHENYL, 4,4'-DIPHENYLENEDIAMINE, BENCIDINA (DOT SPANISH), BENZIDINE (DOT FRENCH), BENZIDINE BASE, BENZIDINE-BASED DYES, C.I. 37225, C.I. AZOIC DIAZO COMPONENT 112, C.I. AZOIC DIAZO COMPONENT 112, FAST CORINTH BASE B, NCI-C03361, P,P'-BIANILINE, P,P'-DIAMINOBIPHENYL, P,P'-DIANILINE, P-BENZIDINE, P-DIAMINODIPHENYL, RCRA WASTE NUMBER U021, UN 1885 | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 184.236 | S | 127 | 401 | 1.25 @ 20°C |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.024 | 10 | 61 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.0032 | 1.3 | 8.1 |
Technical Basis
A review of available sources identified exposure limits (OEL-STEL, OEL-TWA) 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 most preferred species and route toxicity data, a rat oral LD50, was selected as the TEEL-3 basis. The TEEL-2 value was derived according to Table 3.5. The OEL-STEL (Italy) and OEL-TWAs (France and Hungary) appear to be the same value; given that no additional information was included in the OEL-STEL (e.g., short term duration) the OEL-TWA was selected as the TEEL-1 basis.
• TEEL-1 = OEL-TWA (France, 0.001 ppm/0.008 mg/m3) x 3
• TEEL-2 = TEEL-3/6
• TEEL-3 = Rat oral LD50 (309 mg/kg)
This review generated TEEL-3 and TEEL-2 values consistent with Rev. 29A, The Rev. 29A TEEL-1 was derived from the TEEL-2, while the current TEEL-1 basis is an exposure limit (OEL-TWA).
• TEEL-1 = OEL-TWA (France, 0.001 ppm/0.008 mg/m3) x 3
• TEEL-2 = TEEL-3/6
• TEEL-3 = Rat oral LD50 (309 mg/kg)
This review generated TEEL-3 and TEEL-2 values consistent with Rev. 29A, The Rev. 29A TEEL-1 was derived from the TEEL-2, while the current TEEL-1 basis is an exposure limit (OEL-TWA).
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/7111
OELs: https://ilv.ifa.dguv.de/limitvalues/4656
Rat LD50. National Technical Information Service., PB214-270. Retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/7111