Petroleum ether is a colorless, highly volatile liquid. It is mainly composed of hydrocarbons such as alkanes, aromatics, and naphthenes. Petroleum ether has the characteristics of low boiling point, low viscosity and low surface tension, and can volatilize rapidly. It is flammable at room temperature and can form a flammable mixture with air. The density of petroleum ether is low, usually between 0.7 and 0.8 g/cm & sup3; Between. In addition, petroleum ether has good solubility and is soluble in organic solvents such as ethanol, acetone, and ether, but it is difficult to dissolve in water. Due to its volatile and flammable nature, petroleum ethers need to be used or stored with caution and the necessary safety measures should be taken.