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General Description

  • Synonyms: acetyl propanal; acetyl propionyl; β, γ-dioxopentane; beta, gamma-dioxopentane; 2,3-pentadione
  • OSHA IMIS Code Number: P110
  • Chemical Abstracts Service (CAS) Registry Number: 600-14-6
  • NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: SA1850000
  • Department of Transportation Regulation Number (49 CFR 172.101) and Guide: UN 1224 (ketones liquid n.o.s.) and UN 1993 (flammable liquid)
  • Chemical Description and Physical Properties:
    • yellow to green-yellow liquid with a butter odor
    • molecular formula: C5H8O2
    • molecular weight: 100.12
    • boiling point: 110-112°C
    • melting point: -52°C
    • vapor pressure: 2.67 kPa @ 20°C
  • Incompatibilities: heat; electrostatic charge; oxidizing agents; reducing agents; strong bases

Exposure Limits

  • National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 9.3 ppb (0.0093 ppm) TWA; 31 ppb (0.031 ppm) STEL

Health Factors

  • Potential Symptoms: eye, skin and respiratory irritant
  • Health Effects: may be harmful if inhaled as it causes respiratory tract irritation; causes skin irritation; causes eye irritation; may be harmful if swallowed
  • Affected Organs: skin, eyes, respiratory system

Monitoring Methods used by OSHA

Laboratory Sampling/Analytical Method:
  • Two specially dried Silica Gel Tubes in series. Each tube has a single 600-mg 20/40 mesh section and a glass-fiber filter, the filter faces forward when sampling. SKC 226-183, or equivalent. Use an opaque tube holder or wrap tubes with aluminum foil or other opaque material while sampling.
  • maximum volume: 10 liters for long-term sampling (9 liters if sampling for diacetyl and/or acetoin); 3 liters for short-term sampling
  • minimum flow rate: 0.05 L/min for long-term sampling; 0.2 L/min for short-term sampling
  • analytical solvent: (95:5) ethanol: water
  • current analytical method: Gas Chromatography; GC/FID
  • method reference: OSHA Analytical Method (OSHA 1016)
  • method classification: Fully Validated
  • note: Separate the two tubes and cap both ends of each tube as soon as possible after sampling. Individually seal the two tubes. Protect tubes from light after sampling. Samples should be kept cold and shipped cold to the lab by overnight shipping as soon as possible.
Bulk Method:
  • GC/FID

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