Ethyl butyl ketone

May 1994
Immediately Dangerous to Life or Health Concentrations (IDLH)

CAS number: 106–35–4

NIOSH REL: 50 ppm (230 mg/m3) TWA

Current OSHA PEL: 50 ppm (230 mg/m3) TWA

1989 OSHA PEL: Same as current PEL

1993-1994 ACGIH TLV: 50 ppm (234 mg/m3) TWA

Description of Substance: Colorless liquid with a powerful, fruity odor.

LEL:. . Unknown

Original (SCP) IDLH: 3,000 ppm

Basis for original (SCP) IDLH: The chosen IDLH is based on the statements by Patty [1963] and Deichmann and Gerarde [1969] that 0 rats died following a 4-hour exposure to 2,000 ppm, but 6 of 6 rats died following a 4-hour exposure to 4,000 ppm [Smyth et al. 1949].

Short-term exposure guidelines: None developed


Lethal concentration data:

Species Reference LC50(ppm) LCLo(ppm) Time Adjusted 0.5-hrLC (CF) Derivedvalue
Rat Smyth et al. 1949 LC100: 4,000 —– 4 hr 8,000 ppm (2.0) 800 ppm


Lethal dose data:

Species Reference Route LD50(mg/kg) LDLo(mg/kg) Adjusted LD Derived value
Rat Smyth et al. 1949 oral 2,760 —– 4,067 ppm 408 ppm


Other animal data: It has been reported that rats survived a 4-hour exposure to 2,000 ppm [Smyth et al. 1949].

Human data: None relevant for use in determining the revised IDLH.



1. Deichmann WB, Gerarde HW [1969]. Table 50. Toxicity of ketones. In: Toxicology of drugs and chemicals. New York, NY: Academic Press, Inc., p. 736.

2. Patty FA, ed. [1963]. Industrial hygiene and toxicology. 2nd rev. ed. Vol. II. Toxicology. New York, NY: Interscience Publishers, Inc., p. 1741.

3. Smyth HF Jr, Carpenter CP, Weil CS [1949]. Range-finding toxicity data: list III. J Ind Hyg Toxicol 31:60-62.

Page last reviewed: December 4, 2014