Isoprene

Melting point :323-329 °C(lit.)
Boiling point :34 °C(lit.)
Density :0.681 g/mL at 25 °C(lit.)
vapor density :2.35 (vs air)
vapor pressure :8.82 psi ( 20 °C)
refractive index :n20/D 1.422(lit.)
Flash point :−65 °F
storage temp. :Store at <= 20°C.
solubility :0.7g/l
form :solid
pka :>14 (Schwarzenbach et al., 1993)
color :Clear colorless to very pale yellow
Odor :petroleum-like odor
Odor Threshold :0.048ppm
explosive limit :1-9.7%(V)
Water Solubility :0.07 g/100 mL
FreezingPoint :-145.96℃
Thermal Conductivity :0.121 W/(m·K) at 25 ℃
λmax :231nm(neat)(lit.)
Merck :14,5201
BRN :969158
Henry's Law Constant :(x 10^-2 atmm³/mol): 3.45 at 18 °C (dynamic stripping cell-MS, Karl et al., 2003)
Dielectric constant :2.1（25℃）
Stability :Stability Extremely flammable. Readily forms explosive mixtures with air. Note low flash point, low boiling point, high vapour pressure. Unstable - prone to spontaneous polymerization. May contain a polymerization inhibitor. Incompatible with strong oxidizing agents.
InChI :1S/C5H8/c1-4-5(2)3/h4H,1-2H2,3H3
InChIKey :RRHGJUQNOFWUDK-UHFFFAOYSA-N
SMILES :CC(=C)C=C
LogP :2.42 at 20℃
CAS DataBase Reference :78-79-5(CAS DataBase Reference)
IARC :2B (Vol. 60, 71) 1999
NIST Chemistry Reference :1,3-Butadiene, 2-methyl-(78-79-5)
EPA Substance Registry System :Isoprene (78-79-5)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H224 Extremely flammable liquid and vapour Flammable liquids Category 1 Danger H303 May be harmfulif swallowed Acute toxicity,oral Category 5 P312 H320 Causes eye irritation Serious eye damage/eye irritation Category 2B Warning P264, P305+P351+P338,P337+P313 H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning H336 May cause drowsiness or dizziness Specific target organ toxicity,single exposure; Narcotic effects Category 3 Warning P261, P271, P304+P340, P312,P403+P233, P405, P501 H341 Suspected of causing genetic defects Germ cell mutagenicity Category 2 Warning P201,P202, P281, P308+P313, P405,P501 H350 May cause cancer Carcinogenicity Category 1A, 1B Danger H372 Causes damage to organs through prolonged or repeated exposure Specific target organ toxicity, repeated exposure Category 1 Danger P260, P264, P270, P314, P501 H411 Toxic to aquatic life with long lasting effects Hazardous to the aquatic environment, long-term hazard Category 2
Precautionary statements:	P201 Obtain special instructions before use. P202 Do not handle until all safety precautions have been read and understood. P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233 Keep container tightly closed. P240 Ground/bond container and receiving equipment. P241 Use explosion-proof electrical/ventilating/lighting/…/equipment. P242 Use only non-sparking tools. P243 Take precautionary measures against static discharge. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P312 Call a POISON CENTER or doctor/physician if you feel unwell. P337+P313 IF eye irritation persists: Get medical advice/attention. P370+P378 In case of fire: Use … for extinction. P391 Collect spillage. Hazardous to the aquatic environment P403+P233 Store in a well-ventilated place. Keep container tightly closed. P403+P235 Store in a well-ventilated place. Keep cool. P405 Store locked up. P501 Dispose of contents/container to..…