Melting point :-12 °C
Boiling point :178-179 °C3 mm Hg(lit.)
Density :0.936 g/mL at 25 °C(lit.)
refractive index :n20/D 1.441(lit.)
Flash point :>230 °F
storage temp. :Keep in dark place,Sealed in dry,Room Temperature
solubility :hexane, toluene, ethanol and acetone: soluble
pka :-0.52±0.50(Predicted)
form :Solid
color :Dark Brown
Dielectric constant :4.5（30℃）
CAS DataBase Reference :7474-78-4(CAS DataBase Reference)
EPA Substance Registry System :Benzenesulfonic acid, 3,4-diamino- (7474-78-4)

Symbol(GHS):
Signal word:	Warning
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 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
Precautionary statements:	P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.