|Molar mass||106.16 g/mol|
|Melting point||−48 °C (−54 °F; 225 K)|
|Boiling point||139 °C (282 °F; 412 K)|
|Solubility in ethanol||very soluble|
|Solubility in diethyl ether||very soluble|
Refractive index (nD)
|Viscosity||0.8059 cP at 0 °C
0.6200 cP at 20 °C
|Dipole moment||0.33-0.37 D|
|Main hazards||Harmful or fatal if swallowed. Vapor harmful. Flammable liquid and vapor.|
|R-phrases||R10 R20 R21 R38|
|Flash point||25 °C|
|US health exposure limits (NIOSH):|
|TWA 100 ppm (435 mg/m3)|
|Supplementary data page|
|Refractive index (n),
Dielectric constant (εr), etc.
|UV, IR, NMR, MS|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
m-Xylene (or meta-xylene) is an aromatic hydrocarbon, based on benzene with two methyl substituents. It is an isomer of o-xylene and p-xylene. The m stands for meta, meaning the two methyl substituents are at locants 1 and 3 on the aromatic ring. m-Xylene is commonly produced in BTX processes, and separated as needed from the other aromatic hydrocarbons.
The major chemical use of meta-xylene is in the manufacture of isophthalic acid, which is used as a copolymerizing monomer to alter the properties of polyethylene terephthalate (PET), making PET more suitable for the manufacture of soft drinks bottles. To convert m-xylene on an industrial scale to isophthalic acid, the two methyl groups are both catalytically oxidized to carboxyl groups. It is also used as a raw material in the manufacture of 2,4- and 2,6-xylidine as well as a range of smaller-volume chemicals.
- DeanHandb, Lange´s Handbook of chemistry, 15th edition,1999.
- "NIOSH Pocket Guide to Chemical Hazards". National Institute for Occupational Safety and Health (NIOSH). id=0669.
- Ashford's Dictionary of Industrial Chemicals, third edition, page 9692.