O-TOLUIDINE†

Chemical Identification
Chemical Identification
CAS # 95-53-4
Formula

C₇H₉N

Synonyms

o-aminotoluene; 2-aminotoluene; 1-methyl-2-aminobenzene; o-methylaniline; 2-methylaniline; ortho-toluidine

Physical Properties
Physical Properties
Physical description Colorless to pale-yellow liquid with an aromatic, aniline-like odor.
Boiling point 392°F Molecular weight 107.16
Freezing point/melting point 2.7°F Vapor pressure 0.3 mmHg
Flash point 185°F Vapor density 3.69
Specific gravity 0.998 Ionization potential 7.44 eV
Lower explosive limit (LEL) 1.5% Upper explosive limit (UEL)
NFPA health rating 3 NFPA fire rating 2
NFPA reactivity rating 0 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.) 2475
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 73 (fully validated)
Notes
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
 

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

On-Site Screening Techniques
On-Site Screening Techniques
Device Detector tube Infrared spectrophotometer
Model/Type Gastec 181 Miran 1A & 1B
Sampling information
(see manufacturer instructions)
2.5-35 ppm range 0.9 ppm@13.5 µm
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
 

5 ppm (22 mg/m³)

REL-TWA
 

 

TLV-TWA
 

2 ppm [1984]

PEL-TWA
 

2 ppm (9 mg/m³)

PEL-STEL
 

 

REL-STEL
 

 

TLV-STEL
 

 

PEL-STEL
 

 

PEL-C
 

 

REL-C
 

 

TLV-C
 

 

PEL-C
 

 

Skin notation
 

Y

Skin notation
 

Y

Skin notation
 

Y

Skin notation
 

Y

Notes:
 

See 29 CFR 1910.1000 Table Z-1.

Notes:
 

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

Notes:
 

BEI

Notes:
 

 

Health factors:  See NIH-NLM PubChem. IDLH
 

50 ppm

Carcinogenic classifications: IARC-1, NIOSH-Ca, NTP-R, TLV-A3 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 - O-Toluidine

NIOSH: Pocket Guide to Chemical Hazards - o-Toluidine

Literature References

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

Last Updated Date : 01/07/2021