
O xylene, also known as ortho-Xylene, OX. Its molecular formula is C8H10, and its molecular weight is 106.17. It is a colorless, transparent liquid with an aromatic odor similar to that of toluene. It is one of the three isomers of xylene (ortho, meta, and para), is chemically stable, and belongs to the class of aromatic hydrocarbons. It is widely used in plastics, coatings, dyes, pharmaceuticals, pesticides, and other fields.
| Item | Specification |
| Melting Point | -25.2°C |
| Boiling Point | 144.4°C |
| Density | 0.8802 g/cm³ (20°C) |
| Flash Point | 32°C (closed cup) |
| Vapor Pressure | 6.0 mmHg (25°C) |
| Refractive Index | 1.5016 (20°C) |
| Vapor Density | 3.66 (vs. air) |
| Vapor Density | Insoluble in water (0.17–0.2 g/L at 25°C); readily soluble in organic solvents such as ethanol, diethyl ether, acetone, and benzene. |
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