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Dibutyl phthalate																				Related Pages
										May 1994
Immediately Dangerous to Life or Health Concentrations (IDLH)
**CAS number:** 84–74–2
**NIOSH REL:** 5 mg/m3 TWA
**Current OSHA PEL:** 5 mg/m3 TWA
**1989 OSHA PEL:** Same as current PEL
**1993-1994 ACGIH TLV:** 5 mg/m3 TWA
**Description of Substance:** Colorless to faint-yellow, oily liquid with a slight, aromatic odor.
**LEL**(@456 F)**:** 0.5% (10% LEL(@456 F), 32,700 mg/m3)
**Original (SCP) IDLH:** 9,300 mg/m3
**Basis for original (SCP) IDLH:** Because dibutylphthalate has a very low toxicity, the available toxicological data contains no evidence of an IDLH for it. Therefore, the chosen IDLH is based on an analogy with dimethylphthalate, which has an IDLH of 9,300 mg/m3.
**Short-term exposure guidelines:** None developed
**ACUTE TOXICITY DATA**
**Lethal concentration data:**

**Species**
    **Reference**
    **LC50**
    **LCLo**
    **Time**
    **Adjusted 0.5-hr** **LC (CF)**
    **Derived** **value**Rat Mouse
    Antonyuk and Aldyreva 1973 Izmerov et al. 1982
    4,250 mg/m325,000 mg/m3
    ----- -----
    ? 2 hr
    ? 40,000 mg/m3 (1.6)
    ? 4,000 mg/m3
 **Lethal dose data:**
 
 **Species**
    **Reference**
    **Route**
    **LD50** **(mg/kg)**
    **LDLo** **(mg/kg)**
    **Adjusted LD**
    **Derived value**Mouse RatG. pig
    Antonyuk 1963 Sine 1993Timofeevskaia et al. 1980
    oral oraloral
    5,289 8,00010,000
    ----- ----------
    37,023 mg/m356,000 mg/m370,000 mg/m3
    3,702 mg/m35,600 mg/m37,000 mg/m3**Human data:** None relevant for use in determining the revised IDLH.
 
 **Revised IDLH:** 4,000 mg/m3**Basis for revised IDLH:** The revised IDLH for dibutyl phthalate is 4,000 mg/m3 based on acute inhalation toxicity data in animals [Izmerov et al. 1982]. [Note: Due to its low volatility, this concentration could only be reached at elevated temperatures or if the liquid droplets become airborne as in a mist.]
**REFERENCES:**
1. Antonyuk OK [1963]. About the toxicity of didodecylphthalate. Gig Tr Prof Zabol *17*(11):51-52 (in Russian).
2. Antonyuk OK, Aldyreva MV [1973]. Substantiation of maximum permissible concentration of dibutyl phthalate in the air of industrial premises. Gig Tr Prof Zabol *17*(8):26-30 (in Russian).
3. Izmerov NF, Sanotsky IV, Sidorov KK [1982]. Toxicometric parameters of industrial toxic chemicals under single exposure. Moscow, Russia: Centre of International Projects, GKNT, p. 44.
4. Sine C, ed. [1993]. Dibutyl phthalate. In: Farm chemicals handbook ’93, p. C112.
5. Timofeevskaia LA, Ivanova NI, Baliniva ES [1980]. Toxicology of o-phthalic acid and esters and hygienic regimentation. Gig Tr Prof Zabol *24*(3):25-27 (in Russian).

			
							
								Page last reviewed:  December 4, 2014						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Publications & Products
Immediately Dangerous To Life or Health (IDLH) Values
Table of IDLH Values
Criteria for Determining IDLH Values
Historical Documentation
Original (SCP) Values
Abbreviations for IDLH Documentation
Abbreviations for Journal Titles Follow NIOSH Facebook
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