Immediately Dangerous to Life or Health Concentrations (IDLH)
CAS number: 108–94–1
NIOSH REL: 25 ppm (100 mg/m3) TWA [skin]
Current OSHA PEL: 50 ppm (200 mg/m3) TWA
1989 OSHA PEL: 25 ppm (100 mg/m3) TWA [skin]
1993-1994 ACGIH TLV: 25 ppm (100 mg/m3) TWA [skin]
Description of Substance: Water-white to pale-yellow liquid with a peppermint- or acetone-like odor.
LEL(@212 F): 1.1% (10% LEL(@212 F), 1,100 ppm)
Original (SCP) IDLH: 5,000 ppm
Basis for original (SCP) IDLH: The chosen IDLH is based on the statement by AIHA  that a 4-hour exposure of rats to 4,000 ppm did not produce death but 8,000 ppm caused anesthesia and death [Smyth 1956]. In addition, Patty  reported that typical narcotic symptoms have been observed in guinea pigs exposed for 6 hours to 4,000 ppm [Specht et al. 1940].
Short-term exposure guidelines: None developed
ACUTE TOXICITY DATA
Lethal concentration data:
|Gupta et al. 1979|
|6,776 ppm (1.44)|
16,000 ppm (2.0)
8,000 ppm (2.0)
|678 ppm |
Other animal data: RD50 (mouse), 756 ppm [DeCeaurriz et al. 1981].
Human data: It has been reported that exposure to 75 ppm
for 3 to 5 minutes has resulted in pronounced irritation
of the eyes, nose, and throat [Nelson et al. 1943].
|Revised IDLH: 700 ppm
Basis for revised IDLH: The revised IDLH for cyclohexanone is 700 ppm based on acute inhalation toxicity data in animals [Gupta et al. 1979; Smyth 1956].
1. AIHA . Cyclohexanone. In: Hygienic guide series. Am Ind Hyg Assoc J 26:630-633.
2. DeCeaurriz JC, Micillino JC, Bonnet P, Guenier JP . Sensory irritation caused by various industrial airborne chemicals. Toxicol Lett 9:137-143.
3. Gupta PK, Lawrence WH, Turner JE, Autian J . Toxicological aspects of cyclohexanone. Toxicol Appl Pharmacol 49:525-533.
4. Nelson KW, Ege JF Jr, Ross M, Woodman LE, Silverman L . Sensory response to certain industrial solvent vapors. J Ind Hyg Toxicol 25(7):282-285.
5. NPIRI . Raw materials data handbook, physical and chemical properties, fire hazard and health hazard data. Vol. 1. Organic solvents. Bethlehem, PA: National Printing Ink Research Institute, p. 18.
6. Patty FA, ed. . Industrial hygiene and toxicology. 2nd rev. ed. Vol. II. Toxicology. New York, NY: Interscience Publishers, Inc., p. 1767.
7. Smyth HF Jr . Improved communication: hygienic standards for daily inhalation. Am Ind Hyg Assoc Q 17(2):129-185.
8. Specht H, Miller JW, Valaer PJ, Sayers RR . Acute response
of guinea pigs to the inhalation of ketone vapors. Washington,
DC: U.S. Government Printing Office, Federal Security Agency,
U.S. Public Health Service, NIH Bulletin 176:1-66.
- National Institute for Occupational Safety and Health (NIOSH)
- Centers for Disease Control and Prevention
TTY: (888) 232-6348
- New Hours of Operation
- Contact CDC-INFO