Substance profile
Demephion-S
Demephion-S: phosphorothioic acid, o,o-dimethyl s-(2-(methylthio) ethyl) ester appears as a straw-colored liquid.
01 · Identification
What Demephion-S is
Demephion-S: phosphorothioic acid, o,o-dimethyl s-(2-(methylthio) ethyl) ester appears as a straw-colored liquid. It boils at 230 °C.
Under the GHS it carries the signal word Danger.
Other names for Demephion-S
- demephion-S (ISO)
- O,O-dimethyl S-2-methylthioethyl phosphorothioate
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
| Code | Hazard statement |
|---|---|
| H300 | Fatal if swallowed. |
| H311 | Toxic in contact with skin. |
Precautionary statements: P270, P280, P301, P302, P310, P330, P352
03 · Physical and chemical properties
Demephion-S properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 230 °C (446 °F) | at 760 mmHg | DOE PAC |
| 65 °C (149 °F) | decomposes, at 0.1 mmHg (reduced pressure) | CAMEO | |
| Density | 1.207 g/cm³ | at 20 °C | DOE PAC |
| 1.218 g/cm³ | at 25 °C | CAMEO |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Demephion-S
Reactivity
PHOSPHOROTHIOIC ACID, O,O-DIMETHYL S-(2-(METHYLTHIO) ETHYL) ESTER, like other thiophosphate esters, may react with strong reducing agents such as hydrides to give highly toxic and flammable phosphine gas. Partial oxidation by oxidizing agents may result in the release of toxic phosphorus oxides.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Demephion-S in the storage compatibility matrix →