Trixylyl phosphate (TXP) is an aromatic phosphate ester. It was historically used as a flame retardant for acetate plastics (cellulose nitrate and cellulose acetate) and PVC. It also saw significant use as a fire-resistant hydraulic fluid.
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| Names | |
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Other names
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| Identifiers | |
| ECHA InfoCard | 100.042.419 |
| EC Number |
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CompTox Dashboard (EPA) | |
| Properties | |
| C24H27O4P | |
| Molar mass | 410.450 g·mol−1 |
| Appearance | Viscous liquid |
| Density | 1.142 |
| Melting point | −20 °C (−4 °F; 253 K) |
| Boiling point | 394 °C (741 °F; 667 K) |
| 20 µg/L | |
| Hazards | |
| GHS labelling: | |
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| Danger | |
| H360F | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Trixylyl phosphate is now banned or restricted in several jurisdictions, due to its poor safety profile. Short term exposure can cause organophosphate-induced delayed neuropathy,[1] but it is also regarded as a reproductive toxin. In the EU is classified as a substance of very high concern, requiring authorisation to be used.
Synthesis
Trixylyl phosphate is prepared industrially by the reaction of phosphoryl chloride with mixed xylenols. In practise this produces a range of products.