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Benzidine																				Related Pages
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

FormulaNH2C6H4C6H4NH2
	Conversion
	IDLH
			Ca [N.D.]See: IDLH INDEX

Exposure Limits
			NIOSH RELCa 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 Weight184.3	
	Boiling Point752°F
	Melting Point239°F
	Solubility(54°F): 0.04%
	Vapor PressureLow
	Ionization Potential?											
Specific Gravity1.25	
	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 NIOSH Pocket Guide to Chemical Hazards
Introduction
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Chemical Names, Synonyms and Trade Names
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
CAS Numbers
RTECS Numbers
Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
First Aid Procedures Follow NIOSH Facebook
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