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Benzidine

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Synonyms & Trade Names
Benzidine-based dyes, 4,4'-Bianiline, 1,1'-Biphenyl-4,4'-diamine, 4,4'-Biphenyldiamine, 4,4'-Diaminobiphenyl, p-Diaminodiphenyl [Note: Benzidine has been used as a basis for many dyes.]
CAS No.
92-87-5
RTECS No.
DC9625000
DOT ID & Guide
1885 153
Formula
NH₂C₆H₄C₆H₄NH₂
Conversion
IDLH
Ca [N.D.]
See: IDLH INDEX
Exposure Limits
NIOSH REL
Ca See Appendix A See Appendix C
OSHA PEL
[1910.1010] See Appendix B See Appendix C
Measurement Methods
NIOSH 5509;
OSHA 65
See: NMAM or OSHA Methods
Physical Description
Grayish-yellow, reddish-gray, or white crystalline powder. [Note: Darkens on exposure to air and light.]
Molecular Weight
184.3
Boiling Point
752°F
Melting Point
239°F
Solubility
(54°F): 0.04%
Vapor Pressure
Low
Ionization Potential
?
Specific Gravity
1.25
Flash Point
?
Upper Explosive Limit
?
Lower Explosive Limit
?
Combustible Solid, but difficult to burn.
Incompatibilities & Reactivities
Red fuming nitric acid
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
hematuria (blood in the urine); secondary anemia from hemolysis; acute cystitis; acute liver disorders; dermatitis; painful, irreg urination; [potential occupational carcinogen]
Target Organs
Bladder, skin, kidneys, liver, blood
Cancer Site
[liver, kidney & bladder cancer]
Personal Protection/Sanitation
(See protection codes)
Skin:Prevent skin contact
Eyes:Prevent eye contact
Wash skin:When contaminated/Daily
Remove:When wet or contaminated
Change:Daily
Provide:Eyewash, Quick drench
First Aid
(See procedures)
Eye:Irrigate immediately
Skin:Soap wash immediately
Breathing:Respiratory support
Swallow:Medical attention immediately
Respirator Recommendations

(See Appendix E)

NIOSH

At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus

Escape:


(APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter.
Click here for information on selection of N, R, or P filters. 


Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0224   MEDICAL TESTS: 0023
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health