Hexachlorocyclopentadiene
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Hexachlorocyclopentadiene (HCCPD), also known as C-56, Graphlox, and HRS 1655, is an organochlorine compound with the formula C5Cl6. It is a precursor to pesticides, flame retardants, and dyes. It is a colourless liquid, although commercial samples appear lemon-yellow liquid sometimes with a bluish vapour. Many of its derivatives proved to be highly controversial, as studies showed them to be persistent organic pollutants. An estimated 270,000 tons were produced until 1976,[2] and smaller amounts continue to be produced today.
Quick Facts Names, Identifiers ...
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Names | |||
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IUPAC name
1,2,3,4,5,5-hexachlorocyclopenta-1,3-diene | |||
Other names
graphlox, perchlorocyclopentadiene | |||
Identifiers | |||
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3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.000.937 | ||
PubChem CID |
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UNII | |||
CompTox Dashboard (EPA) |
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Properties | |||
C5Cl6 | |||
Molar mass | 272.76 g·mol−1 | ||
Appearance | Pale-yellow to amber-colored liquid | ||
Odor | Pungent, unpleasant[1] | ||
Density | 1.702 g/cm3 | ||
Melting point | −10 °C (14 °F; 263 K) | ||
Boiling point | 239 °C (462 °F; 512 K) | ||
0.0002% (Reacts, 25°C)[1] | |||
Vapor pressure | 0.08 mmHg | ||
Hazards | |||
Occupational safety and health (OHS/OSH): | |||
Main hazards |
Teratogen | ||
Flash point | 100 °C (212 °F; 373 K) | ||
NIOSH (US health exposure limits): | |||
PEL (Permissible) |
none[1] | ||
REL (Recommended) |
TWA 0.01 ppm (0.1 mg/m3)[1] | ||
IDLH (Immediate danger) |
N.D.[1] | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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