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Piperonyl butoxide, chemically known as 3,4-Methylenedioxyphenyl-2-propyl butyl ether (abbreviated as PBO), MF: C₁₉H₃₀O₅ MW: 338.44, is a typical pesticide synergist. At room temperature, it appears as a pale yellow to light brown transparent oily liquid. The pure compound is a colorless liquid with a slight characteristic odor. It remains stable under normal temperature and neutral or weakly acidic conditions, resisting decomposition. Under strongly alkaline conditions (pH > 10), it undergoes hydrolysis to form degradation products such as piperonal, losing its synergistic activity.
| Items | Specifications |
| Boiling Point | 180°C |
| Melting Point | -11°C |
| Density | 1.059 g/mL at 25°C (lit.) |
| Vapor pressure | 0.02 hPa (60°C) |
| Refractive index | n20/D 1.498 (lit.) |
| Flash point | >230°F |
| Specific Gravity | 1.060 (20/4°C) |
| Solubility | Sparingly soluble in water; readily soluble in organic solvents such as ethanol, acetone, toluene, and xylene; miscible with organic solvents in most pesticide formulations. |
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