Melting point :178-182 °C
Boiling point :64.7 °C
Density :0.791
bulk density :360kg/m3
Flash point :12 °C
storage temp. :Store at +5°C to +30°C.
solubility :H₂O: soluble
Colour Index :13020
pka :2.3, 5.0(at 25℃)
form :Solid
color :White to yellow or beige, darkening on exposure to light
Odor :Odorless
PH Range :Red (1.2) to orange (3.4);Red (4.2) to yellow (6.3)
PH :8.2 (10g/l, H2O, 25℃)
Water Solubility :Soluble in water. Slightly soluble in ethanol.
λmax :437nm, 410nm, 493nm
BRN :4065488
Stability :Reported to be unstable, but this is probably a mistake on a commercial MSDS sheet. Incompatible with strong oxidizing agents.
Major Application :optical fibers, liquid crystal cells, holography, inks, toner, corrosion inhibitor, detergent
CAS DataBase Reference :845-10-3(CAS DataBase Reference)
EPA Substance Registry System :Benzoic acid, 2-[[4-(dimethylamino)phenyl]azo]-, sodium salt (845-10-3)

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 H312 Harmful in contact with skin Acute toxicity,dermal Category 4 Warning P280,P302+P352, P312, P322, P363,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 H332 Harmful if inhaled Acute toxicity,inhalation Category 4 Warning P261, P271, P304+P340, P312 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. 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. 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. P304+P340 IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. 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. P321 Specific treatment (see … on this label). P322 Specific measures (see …on this label). P330 Rinse mouth. P332+P313 IF SKIN irritation occurs: Get medical advice/attention. P362 Take off contaminated clothing and wash before reuse. P363 Wash contaminated clothing before reuse. P501 Dispose of contents/container to..…