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General Description

  • Synonyms: ortho-Aminotoluene; o-Methylaniline; 1-Methyl-1,2-amino-benzene; 2-Methylaniline
  • OSHA IMIS Code Number: 2475
  • Chemical Abstracts Service (CAS) Registry Number: 95-53-4
  • NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: XU2975000; 83249
  • Department of Transportation Regulation Number (49 CFR 172.101) and Emergency Response Guidebook: UN 1708 Poison 153
  • NIOSH Pocket Guide to Chemical Hazards, o-Toluidine: Chemical description, physical properties, potentially hazardous incompatibilities, and more
  • Chemical Description and Physical Properties:
    • colorless to pale yellow liquid with a weak, aromatic odor
    • molecular weight: 107
    • boiling point: 391°F
    • vapor pressure: <1 mm
    • melting point: -3°F
  • Incompatibilities: Strong oxidizers

Exposure Limits

  • OSHA Permissible Exposure Limit (PEL):
    • General Industry: 5 ppm, 22 mg/m3 (Skin)
    • Construction Industry: 5 ppm, 22 mg/m3 TWA (Skin)
  • American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 2 ppm, 8.8 mg/m3 TWA (Skin); Appendix A3 (Confirmed Animal Carcinogen with Unknown Relevance to Humans)
  • National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): Potential Carcinogen; lowest feasible concentration (Skin)

Health Factors

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):
  • Coated Glass Fiber Filters (37 mm) in 3 piece cassette. Coating is Sulfuric Acid.
  • maximum volume: 100 Liters
  • maximum flow rate: 1.0 L/min
  • current analytical method: Gas Chromatography; GC/ECD
  • sampling and analytical error: 0.09
  • method reference: 2 (OSHA 73)
  • method classification: Fully Validated
  • note: Filters may be obtained by OSHA personnel from the Salt Lake Technical Center (SLTC).
Secondary Laboratory Sampling/Analytical Method (SAM2):
  • Detector Tube
  • company: Gastec
  • part #: 181
  • range: 2.5-35 ppm
  • classification: Mfg
  • Instrumentation
  • company: Infrared Spectrophotometer
  • part #: MIRAN 1A & 1B
  • range: 0.9 ppm @ 13.5 µm
  • classification: Mfg
Bulk Method:
  • Limit the amount of bulk submitted to one gram or one mL.

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