Cyclopentadiene

Synonyms

1,3-Cyclopentadiene; Cyclopentadiene; Pentole; Pyropentylene; R-Pentine; [ChemIDplus]

Category

Aliphatics, Unsaturated

Description

Colorless liquid with an irritating, terpene-like odor; [NIOSH]

Sources/Uses

Used in resin manufacturing and other organic syntheses; [ACGIH]

Comments

Cyclopentadiene causes narcosis and liver injury in animal experiments. It has an irritating odor that is objectionable to workers. [ACGIH, 1987] A skin, eye, and respiratory tract irritant; [ICSC]"TLV and Documentation withdrawn; . . . Since cyclopentadiene (CPD) dimerizes into DCPD [Dicyclopentadiene], we recommended using the TLV for DCPD if CPD is of concern. There is little information available on the toxicity of CPD." [ACGIH, 2019] See "Dicyclopentadiene."

Biomedical References

Insufficient data

75 ppm

750 ppm

Excerpts from Documentation for IDLHs

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 4­hour exposure to 2,000 ppm [Smyth et al. 1954]. . . . Human data: None relevant for use in determining the revised IDLH.

435 mm Hg

1.8 ppm

LC67 (rat) = 2,000 ppm/4H

Explanatory Notes

Odor threshold from AIHA; Flash point = 77 deg F; VP from HSDB;

Acute solvent syndrome

Hepatoxic (a) from occupational exposure (secondary effect) or (b) in animal studies or in humans after ingestion

Diseases

Occupational diseases associated with exposure to this agent:

• Solvents, acute toxic effect