CAS number: 542927
NIOSH REL: 75 ppm (200 mg/m3) TWA
Current OSHA PEL: 75 ppm (200 mg/m3) TWA
1989 OSHA PEL: Same as current PEL
19931994 ACGIH TLV: 75 ppm (203 mg/m3) TWA
Description of Substance: Colorless liquid with an irritating, terpenelike 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  that 4 of 6 rats died from a 4hour exposure to 2,000 ppm [Smyth et al. 1954].
Shortterm exposure guidelines: None developed
ACUTE TOXICITY DATA
Lethal concentration data:
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 2hour lethal concentration data in mice rather than the 4hour lethal concentration data in rats so as not to magnify the conservatism already present in the correction factors.]
1. Deichmann WB, Gerarde HW . Table 48. Acute toxicity of hydrocarbons. In: Toxicology of drugs and chemicals. New York, NY: Academic Press, Inc., p. 734.
2. Shashkina LF . 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):1319 (in Russian).
3. Smyth HF Jr, Carpenter CP, Weil CS, Pozzani UC . Rangefinding
toxicity data: list V. AMA Arch Ind Hyg Occup Med 10:6168.
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