Melting point :113-115 °C(lit.)
Boiling point :293°C
Density :1.31
bulk density :700kg/m3
vapor density :3.73 (vs air)
vapor pressure :0.1 mm Hg ( 25 °C)
refractive index :n20/D 1.453
Flash point :38°C
storage temp. :room temp
solubility :10g/l
form :Powder
pka :7.7
color :Yellow to green
Odor :irritant odor
PH :4 (1g/l, H2O, 20℃)
biological source :synthetic
Water Solubility :10 g/L (25 ºC)
Specific Heat Capacity :Cp(crystal): 1.19 J/(g·K), at 25℃
Merck :14,8074
BRN :773967
Henry's Law Constant :2.1×10^-2 mol/(m³Pa) at 25℃, HSDB (2015)
Exposure limits :ACGIH:TLV-TWA 0.1 ppm
OSHA:PEL-TWA 0.1 ppm (0.4 mg/m3)
NIOSH:REL-TWA 0.4 mg/m3 Stability :Stable, but light sensitive. Incompatible with strong oxidizing agents. Flammable.
InChI :1S/C6H4O2/c7-5-1-2-6(8)4-3-5/h1-4H
InChIKey :AZQWKYJCGOJGHM-UHFFFAOYSA-N
SMILES :O=C1C=CC(=O)C=C1
LogP :0.1-0.3 at 23℃ and pH4.8-5.3
CAS DataBase Reference :106-51-4(CAS DataBase Reference)
IARC :3 (Vol. 15, Sup 7, 71) 1999
NIST Chemistry Reference :p-Benzoquinone(106-51-4)
EPA Substance Registry System :Quinone (106-51-4)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes 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 H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning H371 May cause damage to organs Specific target organ toxicity, single exposure Category 2 Warning P260, P264, P270, P309+P311, 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. 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. P302+P352 IF ON SKIN: wash with plenty of soap and water. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P332+P313 IF SKIN irritation occurs: Get medical advice/attention. P337+P313 IF eye irritation persists: Get medical advice/attention. P391 Collect spillage. Hazardous to the aquatic environment P403+P233 Store in a well-ventilated place. Keep container tightly closed. P405 Store locked up. P501 Dispose of contents/container to..…