O-TOLIDINE

Chemical Identification
Chemical Identification
CAS # 119-93-7
Formula

C₁₄H₁₆N₂

Synonyms

4,4'-diamino-3,3'-dimethylbiphenyl; diaminoditolyl; 3,3'-dimethylbenzidine; 3,3'-dimethyl-4,4'-diphenyldiamine; 3,3'-tolidine

Physical Properties
Physical Properties
Physical description White to reddish crystals or powder.
Boiling point 392°F Molecular weight 212.3
Freezing point/melting point 264°F Vapor pressure 1x10-6 mmHg (est)
Flash point 471°F Vapor density
Specific gravity 1 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
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 2450
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 71 (fully validated)
Notes
 

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

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.

Wipe Method
Wipe Method
Sampler/Sampling media
 

 

Bulk Method
Bulk Method
 

 

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

 

REL-TWA
 

 

TLV-TWA
 

 

PEL-TWA
 

 

PEL-STEL
 

 

REL-STEL
 

 

TLV-STEL
 

 

PEL-STEL
 

 

PEL-C
 

 

REL-C
 

0.02 mg/m³ [60 minutes]

TLV-C
 

 

PEL-C
 

 

Skin notation
 

NA

Skin notation
 

Y

Skin notation
 

Y

Skin notation
 

NA

Notes:
 

Not established

Notes:
 

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

Notes:
 

TLV value not established [1992]

Notes:
 

Not established

Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: NIOSH-Ca, TLV-A3, IARC-2B, NTP-R Notes:
 

Ca

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

 

Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - 3,3'-Dimethylbenzidine

NIOSH: Pocket Guide to Chemical Hazards - o-Tolidine

Literature References

 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - o-Tolidine. See annual publication for most recent information.

Last Updated Date : 01/07/2021