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Benzidine Structure

Benzidine

Chemical Properties

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 atm?m3/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)
EWG's Food Scores 8-10
FDA UNII 2X02101HVF
Proposition 65 List Benzidine (and its salts)
NIST Chemistry Reference Benzidine(92-87-5)
IARC 1 (Vol. 29, Sup 7, 99, 100F) 2012
EPA Substance Registry System Benzidine (92-87-5)

Safety

Symbol(GHS)
Signal wordDanger
Hazard statements H302-H350-H410
Precautionary statements P201-P202-P264-P273-P301+P312-P308+P313
Hazard Codes  T,N,F,Xn
Risk Statements  45-22-50/53-52/53-39/23/24/25-23/24/25-11-36/37/38-20/21/22-51/53-67
Safety Statements  53-45-60-61-36/37-16-7-36-26
RIDADR  UN 1885 6.1/PG 2
WGK Germany  3
RTECS  DC9625000
8
HazardClass  6.1(a)
PackingGroup  II
HS Code  29215900
Hazardous Substances Data 92-87-5(Hazardous Substances Data)
Toxicity Acute oral LD50 for mice 214 mg/kg, rats 309 mg/kg (quoted, RTECS, 1985).

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