PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dimethyldicyclopentadiene | 26472-00-4 | 1993 |
7.01
7.00
7.11
3.09
3.05
11.00
11.01
15.01
15.02
4.07
|
|||||||||
| Formula | Synonyms | |||||||||||
| C12.H16 | METHYLCYCLOPENTADIENE DIMER, [LIQUID], 3A,4,7,7A-TETRAHYDRODIMETHYL-4,7-METHANOINDENE, 4,7-METHANOINDENE, 3A,4,7,7A-TETRAHYDRODIMETHYL, 4,7-METHANOINDENE, 3A,4,7,7A-TETRAHYDRODIMETHYL-, BIS(METHYLCYCLOPENTADIENE), DIMETHYLDICYCLOPENTADIENE, METHYLCYCLOPENTADIENE DIMER | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 160.28 | L | 200 | 7.5 | 47.8 | 0.941 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 13 | 140 | 830 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 2.0 | 21 | 130 |
Technical Basis
A review of available sources identified the following acute toxicity data (LD50, LC50) for several species and routes. 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 LC50 sources did not report adverse effects so it was not selected for TEEL development; instead, a mouse oral LD50 was selected as a TEEL-3 basis. TEEL-2 and TEEL-1 values were derived according to Table 3.5. TEEL-3 value was calculated based on mouse oral LD50 study.
• TEEL-1 = TEEL-2/11
• TEEL-2 = TEEL-3/6
• TEEL-3 = Mouse oral LD50 (7700 mg/kg)
This review generated TEEL values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 basis was rat LC50 which was not found during this review. Instead, analysts selected a mouse oral LD50 as the TEEL-3 basis. The Rev. 29A and current TEEL-2 and TEEL-1 use the same methodology with differences due to the change in TEEL-3.
• TEEL-1 = TEEL-2/11
• TEEL-2 = TEEL-3/6
• TEEL-3 = Mouse oral LD50 (7700 mg/kg)
This review generated TEEL values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 basis was rat LC50 which was not found during this review. Instead, analysts selected a mouse oral LD50 as the TEEL-3 basis. The Rev. 29A and current TEEL-2 and TEEL-1 use the same methodology with differences due to the change in TEEL-3.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Methylcyclopentadiene-dimer
Mouse LD50. Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 25(5), Pg. 45, 1981. Retrieved from Lethality Effect Level (drop-down): https://comptox.epa.gov/dashboard/chemical/hazard/DTXSID3027902