Immediately Dangerous to Life or Health Concentrations (IDLH)
CAS number: 109–60–4
NIOSH REL: 200 ppm (840 mg/m3) TWA, 250 ppm (1,050 mg/m3) STEL
Current OSHA PEL: 200 ppm (840 mg/m3) TWA
1989 OSHA PEL: 200 ppm (840 mg/m3) TWA, 250 ppm (1,050 mg/m3) STEL
1993-1994 ACGIH TLV: 200 ppm (835 mg/m3) TWA, 250 ppm (1,040 mg/m3) STEL
Description of substance: Colorless liquid with a mild, fruity odor.
LEL(@100°F): 1.7% (10% LEL(@100°F), 1,700 ppm)
Original (SCP) IDLH: 8,000 ppm
Basis for original (SCP) IDLH: The chosen IDLH is based on the statement by ACGIH  that a 4-hour exposure to 8,000 ppm was fatal to 4 of 6 rats [Smyth et al. 1954].
Short-term exposure guidelines: None developed
ACUTE TOXICITY DATA:
Lethal concentration data:
|Species||Reference||LC50(ppm)||LCLo(ppm)||Time||Adjusted 0.5-hrLC (CF)||Derived value|
|Cat||Flury & Wirth 1933||—–||8,941||5 hr||19,223 ppm (2.15)||1,922 ppm|
|Rat||Smyth et al. 1969||LC67: 8,000||—–||4 hr||16,000 ppm (2.0)||1,600 ppm|
Lethal dose data:
|Species||Reference||Route||LD50(mg/kg)||LDLo(mg/kg)||Adjusted LD||Derived value|
|Jenner et al. 1964Jenner et al. 1964
Smyth et al. 1969
|15,433 ppm13,671 ppm
|1,543 ppm1,367 ppm
Other animal data: It has been reported that based on acute inhalation studies, n-propyl acetate appears to be more toxic than isopropyl acetate and ethyl acetate but less toxic than n-butyl acetate [ACGIH 1991].
Human data: None relevant for use in determining the revised IDLH.
|Revised IDLH: 1,700 ppmBasis for revised IDLH: The revised IDLH for n-propyl acetate is 1,700 ppm based on acute inhalation toxicity data in animals [Flury and Wirth 1933; Smyth et al. 1969]. The revised IDLH is roughly the same as the revised IDLHs for ethyl acetate and n-butyl acetate and is also 10% of the lower explosive limit of 1.7% (which was determined at 100°F). This may be a conservative value due to the lack of relevant acute inhalation toxicity data for workers.|
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