Melting point :127-128 °C
Boiling point :402°C
Density :1.25
vapor pressure :Based on the specific vapor density value of 6.36 (Sims et al., 1988), the vapor pressure wascalculated to be 0.83 at 20 °C.
refractive index :1.6266 (estimate)
Flash point :11 °C
storage temp. :2-8°C
solubility :Soluble in ethanol (U.S. EPA, 1985) and ether (1 g/50 mL) (Windholz et al., 1983)
pka :4.66(at 30℃)
color :Grayish-yellow, crystalline powder; white or sltlyreddish crystals, powder
Water Solubility :Sparingly soluble. <0.1 g/100 mL at 22 ºC
Merck :13,1077
BRN :742770
Henry's Law Constant :(x 10^-11 atmm³/mol): 3.88 at 25 °C (estimated, Howard, 1989)
Exposure limits :Because it is a carcinogen and readily absorbed through skin, no TLV has been assigned. Exposure should be at an absolute minimum.
Recognized Human Carcinogen (ACGIH); Human Carcinogen (MSHA); Carcinogen (OSHA); Human Sufficient Evidence, Animal Sufficient Evidence (IARC). Stability :Stable. Combustible. Incompatible with strong oxidizing agents.
InChIKey :HFACYLZERDEVSX-UHFFFAOYSA-N
CAS DataBase Reference :92-87-5(CAS DataBase Reference)
IARC :1 (Vol. 29, Sup 7, 99, 100F) 2012
NIST Chemistry Reference :Benzidine(92-87-5)
EPA Substance Registry System :Benzidine (92-87-5)

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 H350 May cause cancer Carcinogenicity Category 1A, 1B Danger 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:	P201 Obtain special instructions before use. P202 Do not handle until all safety precautions have been read and understood. P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P270 Do not eat, drink or smoke when using this product. 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. P308+P313 IF exposed or concerned: Get medical advice/attention. P330 Rinse mouth. P391 Collect spillage. Hazardous to the aquatic environment P405 Store locked up. P501 Dispose of contents/container to..…