2,4-Dichlorophenoxyacetic acid

Melting point :136-140 °C (lit.)
Boiling point :160 °C (0.4 mmHg)
Density :1.563
vapor pressure :0.4 mm Hg ( 160 °C)
refractive index :1.5000 (estimate)
Flash point :160°C/0.4mm
storage temp. :2-8°C
solubility :Soluble in organic solvents (ethanol, acetone, dioxane)
pka :pK1:2.64 (25°C)
form :crystalline
color :off-white to tan
PH Range :Acidic
Odor Threshold :3.13 ppm
Water Solubility :Slightly soluble. Decomposes. 0.0890 g/100 mL
Merck :14,2796
BRN :1214242
Henry's Law Constant :6.72 and 0.84 x 10^-5 atm?m³/mol were reported at pH values of 1 and 7, respectively (wetted-wall column, Rice et al., 1997a)
Exposure limits :NIOSH REL: TWA 10 mg/m3, IDLH 100 mg/m3; OSHA PEL: TWA 10 mg/m3; ACGIH TLV: TWA 10 mg/m3.
Stability :Stable, but moisture-sensitive and may be light-sensitive. Incompatible with strong oxidizing agents, corrodes many metals. Decomposes in water.
LogP :2.810
CAS DataBase Reference :94-75-7(CAS DataBase Reference)
IARC :2B (Vol. 113) 2018
NIST Chemistry Reference :(2,4-Dichlorophenoxy)acetic acid(94-75-7)
EPA Substance Registry System :2,4-D (94-75-7)

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 H317 May cause an allergic skin reaction Sensitisation, Skin Category 1 Warning P261, P272, P280, P302+P352,P333+P313, P321, P363, P501 H318 Causes serious eye damage Serious eye damage/eye irritation Category 1 Danger P280, P305+P351+P338, P310 H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning 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:	P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P301+P312 IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. 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.