CYCLOPENTADIENE†

Chemical Identification
Chemical Identification
CAS # 542-92-7
Formula

C₅H₆

Synonyms

1,3-cyclopentadiene

Physical Properties
Physical Properties
Physical description Colorless liquid with an irritating, terpene-like odor.
Boiling point 107°F Molecular weight 66.1
Freezing point/melting point -121°F Vapor pressure 400 mmHg
Flash point 77°F (open cup) Vapor density
Specific gravity 0.80 Ionization potential 8.56 eV
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating NFPA fire rating
NFPA reactivity rating NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 0845
Sampling group
Sampler/Sampling media Chromosorb 104® (discontinued)
Sampling time*
Sampling volume (TWA)*

1-5 L

Sampling flow rate (TWA)*

0.01-0.05 L/min

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments GC-FID
Method reference NIOSH 2523 (fully validated)
Notes
Special requirements

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Wipe Method
Sampler/Sampling media
Bulk Method
Bulk Method
On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
Exposure Limits
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA

75 ppm (200 mg/m³)

REL-TWA

75 ppm (200 mg/m³)

TLV-TWA

0.5 ppm [2018]

PEL-TWA

75 ppm (200 mg/m³)

PEL-STEL REL-STEL TLV-STEL

1 ppm [2018]

PEL-STEL
PEL-C REL-C TLV-C PEL-C
Skin notation

N

Skin notation

N

Skin notation

N

Skin notation

N

Notes:

See 29 CFR 1910.1000 Table Z-1.

Notes: Notes: Notes:
Health factors:  See NIH-NLM PubChem. IDLH

750 ppm

Carcinogenic classifications: Not listed Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Cyclopentadiene

NIOSH: Pocket Guide to Chemical Hazards - Cyclopentadiene

Literature References

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Cyclopentadiene. See annual publication for most recent information.

Last Updated Date : 12/22/2020