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Cyclopentadiene																				Related Pages
										May 1994
Immediately Dangerous to Life or Health Concentrations (IDLH)
**CAS number:** 542–92–7
**NIOSH REL:** 75 ppm (200 mg/m3) TWA
**Current OSHA PEL:** 75 ppm (200 mg/m3) TWA
**1989 OSHA PEL:** Same as current PEL
**1993-1994 ACGIH TLV:** 75 ppm (203 mg/m3) TWA
**Description of Substance:** Colorless liquid with an irritating, terpene-like odor.
**LEL:** . . Unknown
**Original (SCP) IDLH:** 2,000 ppm
**Basis for original (SCP) IDLH:** The chosen IDLH is based on the statement by Deichmann and Gerarde [1969] that 4 of 6 rats died from a 4-hour exposure to 2,000 ppm [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-hr** **LC (CF)**
    **Derived** **value**Rat MouseRat
    Shashkina 1965 Shashkina 1965Smyth et al. 1954
    14,182 5,091LC67: 2,000
    ----- ----------
    2 hr 2 hr4 hr
    22,691 ppm (1.6) 8,146 ppm (1.6)4,000 ppm (2.0)
    2,269 ppm 815 ppm400 ppm
 **Human data:** None relevant for use in determining the revised IDLH.
 
 **Revised IDLH:** 750 ppm **Basis for revised IDLH:** The revised IDLH for cyclopentadiene is 750 ppm based on acute inhalation toxicity data in animals [Shashkina 1965]. [Note: It was decided to use the 2-hour lethal concentration data in mice rather than the 4-hour lethal concentration data in rats so as not to magnify the conservatism already present in the correction factors.]
**REFERENCES:**
1. Deichmann WB, Gerarde HW [1969]. Table 48. Acute toxicity of hydrocarbons. In: Toxicology of drugs and chemicals. New York, NY: Academic Press, Inc., p. 734.
2. Shashkina LF [1965]. Materials for substantiation of maximum permissible concentration of cyclopentadiene and of its dimer — dicyclopentadiene — in the atmosphere of industrial premises. Gig Tr Prof Zabol *9*(12):13-19 (in Russian).
3. Smyth HF Jr, Carpenter CP, Weil CS, Pozzani UC [1954]. Range-finding toxicity data: list V. AMA Arch Ind Hyg Occup Med *10*:61-68.

			
							
								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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