Catechol

Melting point :100-103 °C (lit.)
Boiling point :245 °C (lit.)
Density :1,371 g/cm³
vapor density :3.8 (vs air)
vapor pressure :1 mm Hg ( 75 °C)
refractive index :1.6120 (estimate)
Flash point :279 °F
storage temp. :Store below +30°C.
solubility :430g/l
form :Crystalline Flakes
pka :9.85(at 20℃)
color :white to faintly beige
PH :6 (100g/l, H2O, 20℃)
Odor :Characteristic odor
biological source :synthetic (organic)
explosive limit :1.97%(V)
Water Solubility :430 g/L (20 ºC)
Sensitive :Air & Light Sensitive
Merck :14,7999
BRN :471401
Henry's Law Constant :8.2×10³ mol/(m³Pa) at 25℃, Duchowicz et al. (2020)
Exposure limits :TLV-TWA 5 ppm (～22 mg/m³) (ACGIH). .
Stability :Stable. Substances to be avoided include acid chlorides, acid anhydrides, bases, oxidizing agents, nitric acid. Light sensitive; may discolour on exposure to air. Combustible.
Cosmetics Ingredients Functions :HAIR DYEING
InChI :1S/C6H6O2/c7-5-3-1-2-4-6(5)8/h1-4,7-8H
InChIKey :YCIMNLLNPGFGHC-UHFFFAOYSA-N
SMILES :Oc1ccccc1O
LogP :0.93
CAS DataBase Reference :120-80-9(CAS DataBase Reference)
NIST Chemistry Reference :1,2-Benzenediol(120-80-9)
IARC :2B (Vol. 15, Sup 7, 71) 1999
EPA Substance Registry System :Catechol (120-80-9)

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 H317 May cause an allergic skin reaction Sensitisation, Skin Category 1 Warning P261, P272, P280, P302+P352,P333+P313, P321, P363, P501 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 H341 Suspected of causing genetic defects Germ cell mutagenicity Category 2 Warning P201,P202, P281, P308+P313, P405,P501 H351 Suspected of causing cancer Carcinogenicity Category 2 Warning P201, P202, P281, P308+P313, P405,P501 H361 Suspected of damaging fertility or the unborn child Reproductive toxicity Category 2 Warning P201, P202, P281, P308+P313, P405,P501 H370 Causes damage to organs Specific target organ toxicity, single exposure Category 1 Danger P260, P264, P270, P307+P311, P321,P405, P501 H401 Toxic to aquatic life Hazardous to the aquatic environment, acute hazard Category 2 P273, P501
Precautionary statements:	P201 Obtain special instructions before use. P202 Do not handle until all safety precautions have been read and understood. 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. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P333+P313 IF SKIN irritation or rash occurs: Get medical advice/attention. P337+P313 IF eye irritation persists: Get medical advice/attention. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P405 Store locked up. P501 Dispose of contents/container to..…