Melting point :−10 °C(lit.)
Boiling point :239 °C753 mm Hg(lit.)
Density :1.702 g/mL at 25 °C(lit.)
vapor pressure :0.13 psi ( 20 °C)
refractive index :n20/D 1.5644(lit.)
Flash point :109 °C
storage temp. :2-8°C
solubility :Chloroform (Sparingly), Ethyl Acetate (Slightly)
form :Yellow to amber-colored liquid
color :Colourless to Pale Yellow
Water Solubility :805ug/L(22.5 ºC)
Henry's Law Constant :1.64(x 10^-2 atm?m³/mol) at 25 °C (gas stripping-GC, Warner et al., 1987) 1.6(x 10^-2 atm?m³/mol) (Pankow and Rosen, 1988)
Exposure limits :NIOSH REL: 10 ppb (100 mg/m³); ACGIH TLV: TWA 0.01 ppm (adopted), 0.002 mg/m³ ppm (skin).
Dielectric constant :2.9100000000000001
Stability :Stability Stable, but light-sensitive. Non-flammable. Very reactive with alkenes and polynuclear hydrocarbons. Explosive with sodium. Incompatible with strong oxidizing agents, most common metals.
CAS DataBase Reference :77-47-4(CAS DataBase Reference)
NIST Chemistry Reference :1,3-Cyclopentadiene, 1,2,3,4,5,5-hexachloro-(77-47-4)
EPA Substance Registry System :Hexachlorocyclopentadiene (77-47-4)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501 H311 Toxic in contact with skin Acute toxicity,dermal Category 3 Danger P280, P302+P352, P312, P322, P361,P363, P405, P501 H314 Causes severe skin burns and eye damage Skin corrosion/irritation Category 1A, B, C Danger P260,P264, P280, P301+P330+ P331,P303+P361+P353, P363, P304+P340,P310, P321, P305+ P351+P338, P405,P501 H330 Fatal if inhaled Acute toxicity,inhalation Category 1, 2 Danger P260, P271, P284, P304+P340, P310,P320, P403+P233, 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:	P260 Do not breathe dust/fume/gas/mist/vapours/spray. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P284 Wear respiratory protection. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P310 Immediately call a POISON CENTER or doctor/physician.