PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hexachlorocylopentadiene | 77-47-4 | 2646 |
14.01
4.01
11.01
14.02
4.08
4.05
7.01
8.00
11.00
4.09
|
|||||||||
| Formula | Synonyms | |||||||||||
| C5Cl6 | HEXACHLOROCYCLOPENTADIENE, 1,2,3,4,5,5-HEXACHLORO-1,3-CYCLOPENTADIENE, 1,3-CYCLOPENTADIENE, 1,2,3,4,5,5-HEXACHLORO-, C 56, C-56, GRAPHLOX, HCCPD, HEXACHLORO-1,3-CYCLOPENTADIENE, HEXACHLOROCYCLOPENTADIEN, HEXACHLOROCYCLOPENTADIÈNE (DOT FRENCH), HEXACHLOROPENTADIENE, HEXACLOROCICLOPENTADIENO (DOT SPANISH), HRS 1655, NCI-C55607, PCL, PERCHLOROCYCLOPENTADIENE | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 272.77 | L | -9 | 239 | 0.06 | 25 | 1.7019 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.33 | 1.9 | 11 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.030 | 0.17 | 0.99 |
Technical Basis
A review of available sources identified exposure limits (LOC, OEL-STEL, OEL-TWA) and acute toxicity data (LC50, LCLo, 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. Inhalation exposures were scaled to 60-minute equivalents using the ten Berge equation (Section 3.3.4). The most preferred species acute inhalation data, a dog LCLo, was selected as the TEEL-3. The TWA-TLV was selected as the TEEL-1 basis. The LOC was considered as the TEEL-2; however, the value resulted in a TEEL-2 < TEEL-1. Instead, the TEEL-2 value was derived according to Table 3.5.
• TEEL-1 = TLV-TWA (0.01 ppm) x 3
• TEEL-2 = TEEL-3/6
• TEEL-3 = Dog LCLo (840 mg/m3/30M)
This review generated TEEL-2 values inconsistent with Rev. 29A. The Rev. 29A TEEL-2 basis was a rat oral TDLo not found during the review. The Rev. 29A and current TEEL-3 and TEEL-1 values, bases, and methodologies are consistent.
• TEEL-1 = TLV-TWA (0.01 ppm) x 3
• TEEL-2 = TEEL-3/6
• TEEL-3 = Dog LCLo (840 mg/m3/30M)
This review generated TEEL-2 values inconsistent with Rev. 29A. The Rev. 29A TEEL-2 basis was a rat oral TDLo not found during the review. The Rev. 29A and current TEEL-3 and TEEL-1 values, bases, and methodologies are consistent.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Hexachlorocyclopentadiene
Exposure limits: https://www.osha.gov/chemicaldata/637
Dog LCLo. VCVGH,551,1990. Retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/Hexachlorocyclopentadiene