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General Description

  • Synonyms: Benzene tetrahydride; 1,2,3,4-Tetrahydrobenzene
  • OSHA IMIS Code Number: 0840
  • Chemical Abstracts Service (CAS) Registry Number: 110-83-8
  • NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: GW2500000; 28668
  • Department of Transportation Regulation Number (49 CFR 172.101) and Emergency Response Guidebook: UN2256 Flammable Liquid
  • NIOSH Pocket Guide to Chemical Hazards, Cyclohexene: chemical description, physical properties, potentially hazardous incompatibilities, and more
  • Chemical Description and Physical Properties:
    • colorless liquid with a sweetish odor
    • molecular weight: 82
    • vapor pressure: 67 mm
    • boiling point: 181°F
    • melting point: -155°F

Incompatibilities: Strong oxidizers

Exposure Limits

  • OSHA Permissible Exposure Limit (PEL):
    • General Industry: 300 ppm, 1015 mg/m3
    • Construction Industry: 300 ppm, 1015 mg/m3 TWA
  • American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 300 ppm, 1010 mg/m3 TWA
  • National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 300 ppm TWA

Health Factors

Potential Symptoms: Skin, eye, respiratory system irritation; drowsiness

Health Effects: Irritation-Eye, Nose, Throat, Skin---Moderate (HE15) Cumulative systemic toxicity (HE3); Narcosis (HE8)

Affected Organs: Skin, eyes, respiratory system

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):
  • Charcoal Tube (100/50 mg sections, 20/40 mesh)
  • analytical solvent: Carbon Disulfide
  • maximum volume: 5 Liters
  • maximum flow rate: 0.2 L/min
  • current analytical method: Gas Chromatography; GC/FID
  • method reference: 1 (NIOSH 1500 (PDF))
  • sampling and analytical error: 0.12
  • method classification: Partially Validated
Secondary Laboratory Sampling/Analytical Method (SAM2):
  • Detector Tube
  • company: Gastec
  • part #: 151
  • range: 100-1000 ppm
  • class: Mfg
  • Instrumentation
  • company: Infrared Spectrophotometer
  • part #: MIRAN 103
  • range: 0-600 ppm @ 8.7 um
  • class: Mfg
  • Instrumentation
  • company: Infrared Spectrophotometer
  • part #: MIRAN 1A & 1B
  • range: 4.4 ppm @ 8.8 um
  • class: Mfg

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