Melting point :-19 °C
Boiling point :210-220 °C(lit.)
Density :1.68
vapor pressure :0.2 mm Hg ( 20 °C)
refractive index :n20/D 1.555(lit.)
Flash point :210-220°C
storage temp. :+4°C
solubility :Soluble in ethanol and ether (U.S. EPA, 1985)
form :liquid, clear
Odor :faint turpentine odor
Water Solubility :(mg/L):
4.78 at 25 °C (shake flask-LSC, Banerjee et al., 1980)
4 at 20–25 °C (Geyer et al., 1980) Merck :14,4678
BRN :1766570
Henry's Law Constant :3.55, 5.87, 6.90, 10.5, and 15.3 at 2.0, 6.0, 10.0, 18.0, and 25.0 °C, respectively (EPICS-SPME, Dewulf et al., 1999)
Exposure limits :Potential occupational carcinogen. NIOSH REL: TWA 20 ppb (240 mg/m³); ACGIH TLV: TWA 0.02 ppm (adopted).
Dielectric constant :2.6（Ambient）
Stability :Stable. Incompatible with rubber, oxidizing agents.
CAS DataBase Reference :87-68-3(CAS DataBase Reference)
IARC :3 (Vol. 73) 1999
EPA Substance Registry System :Hexachlorobutadiene (87-68-3)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H301 Toxic if swalloed Acute toxicity,oral Category 3 Danger P264, P270, P301+P310, P321, P330,P405, P501 H310 Fatal in contact with skin Acute toxicity,dermal Category 1, 2 Danger P262, P264, P270, P280, P302+P350,P310, P322, P361, P363, P405, P501 H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P H351 Suspected of causing cancer Carcinogenicity Category 2 Warning P201, P202, P281, P308+P313, P405,P501 H410 Very toxic to aquatic life with long lasting effects Hazardous to the aquatic environment, long-term hazard Category 1 Warning P273, P391, P501
Precautionary statements:	P202 Do not handle until all safety precautions have been read and understood. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.