Label abbreviations descriptions

3,3'-DICHLOROBENZIDINE (and its salts)‡

Chemical Identification
CAS # 91-94-1
Formula

C₁₂H₁₀Cl₂N₂
Synonyms

4,4'-diamino-3,3'-dichlorobiphenyl; dichlorobenzidine base; o,o'-Dichlorobenzidine; 3,3'-dichlorobiphenyl-4,4'-diamine; 3,3'-Dichloro-4,4'-biphenyldiamine; 3,3'-dichloro-4,4'-diaminobiphenyl

Physical Properties
Physical description Gray to purple, crystalline solid.
Boiling point 788°F Molecular weight 253.13
Freezing point/melting point 270-271°F Vapor pressure
Flash point Vapor density
Specific gravity Ionization potential
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating NFPA fire rating
NFPA reactivity rating NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 0869
Sampling group
Sampler/Sampling media 2 GFFs (37 mm) coated with sulfuric acid, in 3-piece cassette, separated by the ring section [SKC 225-9004]
Sampling time*

100 min
Sampling volume (TWA)*

100 L
Sampling flow rate (TWA)*

1 L/min
Sampling volume (STEL/Peak/C)*

15 L
Sampling flow rate (STEL/Peak/C)*

1 L/min
Analytical method instruments GC-ECD
Method reference OSHA 65 (fully validated)
Notes

Within 10 hours after sampling, transfer filter to glass vial containing 2 mL deionized water.

Sample must be shipped and stored at 0°C or colder. Analyze as soon as possible.

Filters may be obtained by OSHA personnel from SLTC.
Special requirements

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
 

Wipe with GFF (37 mm), Type A/E [AP4003705]
Bulk Method
 

Limit the amount of bulk submitted to 1 g or 1 mL.

On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)

Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA
 

Ca

 REL-TWA
 

 

 TLV-TWA
 

 

 PEL-TWA
 

 
PEL-STEL
 

 

 REL-STEL
 

 

 TLV-STEL
 

 

 PEL-STEL
 

 
PEL-C
 

 

 REL-C
 

 

 TLV-C
 

 

 PEL-C
 

 
Skin notation
 

N

 Skin notation
 

N

 Skin notation
 

Y

 Skin notation
 

Y
Notes:
 

See 29 CFR 1910.1003, 13 Carcinogens.

 Notes:
 

CARCINOGEN (Ca): REDUCE EXPOSURE TO LOWEST FEASIBLE CONCENTRATION. See Appendix A, NIOSH Potential Occupational Carcinogens.

 Notes:
 

Exposure by all routes should be carefully controlled to levels as low as possible. [1990]

 Notes:
 

See California Code of Regulations, Title 8, Section 5209. Carcinogens.
Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: IARC-2B, NIOSH-Ca, NTP-R, OSHA-Ca, TLV-A3, EPA-B2 Notes:
 

Ca
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 

 

Additional Resources and Literature References

Last Updated Date : 12/15/2020