Chemical Safety Program: PACs for Chemicals of Concern

PAC Database - Detailed Chemical Data

Chemical Identity

Chemical	CAS#	UN#	Health Code Numbers
Dicyclopentadiene	77-73-6	2048	14.01 11.01 14.02 4.05 7.01 8.00 7.00 11.00 4.09 4.07
Formula	Synonyms
C10.H12	DICYCLOPENTADIENE, 1,3-CYCLOPENTADIENE, DIMER, 1,3-DICYCLOPENTADIENE DIMER, 3A,4,7,7A-TETRAHYDRO-, 3A,4,7,7A-TETRAHYDRO-4,7-METHANOINDENE, 4,7-METHANOINDENE, 4,7-METHANOINDENE, 3A,4,7,7A-TETRAHYDRO-, BICYCLOPENTADIENE, BISCYCLOPENTADIENE, CYCLOPENTADIENE DIMER, DCPD, DICICLOPENTADIENO (DOT SPANISH), DICY, DICYCLOPENTADIÈNE (DOT FRENCH), TRICYCLO[5.2.1.02,6]DECA-3,8-DIENE

Physical Properties

Mol Wt	State	MP (°C)	BP (°C)	VP (Hg)	VP (°C)	SG	LEL (ppm)
132.22	L	32.9	166.6	10	47.6	0.976 @ 35°C	8000

PAC Values

PAC Values (Original Units: ppm)
PAC-1	PAC-2	PAC-3
0.010	5.0	75

Converted PAC Values (mg/m3)
PAC-1	PAC-2	PAC-3
0.054	27	410

Technical Basis

A review of available sources identified several acute animal toxicity studies (LD50, LCLO, LC50) for various species and routes, and exposure limits (ERPGs, TWAs, STELs). Data sources were selected according to the hierarchy listed in Table 3.1. Toxicity data were selected according to type of exposure, species, and route according to the hierarchies stated in Sections 3.3.1, 3.3.2, and evaluated using factors in Tables 3.2, 3.3, and 3.4. The ERPGs were selected as the TEELs due to their priority among the emergency exposure limits (Section 1).
• TEEL-1 = ERPG-1
• TEEL-2 = ERPG-2
• TEEL-3 = ERPG-3
This review generated TEEL values consistent with Rev. 29A*.

References

Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Dicyclopentadiene.

TWAs and STELs: https://www.osha.gov/chemicaldata/642 and https://ilv.ifa.dguv.de/limitvalues/20273

ERPGs: https://cameochemicals.noaa.gov/chemical/3179

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PAC values marked with a subscript "A" correspond to 60-minute AEGL values.
PAC values marked with a subscript "E" correspond to ERPG values.
PAC values marked by * are >= 10% lower explosive limit (LEL) but < 50% LEL.
PAC values marked by ** are > 50% LEL but < 100% LEL.
PAC values marked by *** are >= LEL.