PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dimethyl methylphosphonate; (DMMP) | 756-79-6 | 1993 |
7.01
8.00
11.00
4.09
4.10
3.09
3.10
3.07
3.01
5.00
|
|||||||||
| Formula | Synonyms | |||||||||||
| C3H9O3P | DIMETHYL METHYLPHOSPHONATE, DIMETHOXYMETHYL PHOSPHINE OXIDE, DIMETHYL METHANEPHOSPHONATE, DMMP, FURAN TF 2000, FYROL DMMP, METARAN, METHANEPHOSPHONIC ACID DIMETHYL ESTER, METHYLPHOSPHONIC ACID DIMETHYL ESTER, NCI-C54762, O,O-DIMETHYL METHYLPHOSPHONATE, REOFLAM DMMP | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 124.09 | L | 181 | 0.962 | 25 | 1.168 @ 20°C |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 11 | 120 | 730 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 2.2 | 24 | 140 |
Technical Basis
A review of available data identified the following toxicity exposures: LC50 and LD50 (rat, mouse) for inhalation and oral 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 rat LC50 was the most preferred toxicity route and was selected as the TEEL-3 basis. TEEL-2 and TEEL-1 values were derived according to Table 3.5.
• TEEL-1 = TEEL-2/11
• TEEL-2 = TEEL-3/6
• TEEL-3 = Rat LC50 (26100 mg/m3/1H)
This review generated TEEL values that are inconsistent with those published in Rev. 29A. The current TEEL-3 basis is a more preferred route than Rev. 29A (LC50 > LD50). The Rev. 29A TEEL-2 basis, a rat TDLo, was not found during current review. The current and Rev. 29A methodology are consistent; the current value is lower due to the change in TEEL-2 value.
• TEEL-1 = TEEL-2/11
• TEEL-2 = TEEL-3/6
• TEEL-3 = Rat LC50 (26100 mg/m3/1H)
This review generated TEEL values that are inconsistent with those published in Rev. 29A. The current TEEL-3 basis is a more preferred route than Rev. 29A (LC50 > LD50). The Rev. 29A TEEL-2 basis, a rat TDLo, was not found during current review. The current and Rev. 29A methodology are consistent; the current value is lower due to the change in TEEL-2 value.
References
https://cameochemicals.noaa.gov/chemical/20244
Rat, 1-hr LC50 (26.1 mg/L); Stauffer Chemical Company, Study No. T-4551. Acute Inhalation Toxicity. February 27, 1974, Akzo Nobel internal report (unpublished). Retrieved from: https://comptox.epa.gov/dashboard/chemical/hazard/DTXSID0020494. Also retrievable from: https://haz-map.com/Agents/4952.