m-Xylene
m-Xylene (meta-xylene) is an aromatic hydrocarbon. It is one of the three isomers of dimethylbenzene known collectively as xylenes. The m- stands for meta-, indicating that the two methyl groups in m-xylene occupy positions 1 and 3 on a benzene ring. It is in the positions of the two methyl groups, their arene substitution pattern, that it differs from the other isomers, o-xylene and p-xylene. All have the same chemical formula C6H4(CH3)2. All xylene isomers are colorless and highly flammable.
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| Names | |||
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| Preferred IUPAC name
1,3-Xylene | |||
| Systematic IUPAC name
1,3-Dimethylbenzene | |||
| Other names
m-Xylene, meta-Xylol | |||
| Identifiers | |||
3D model (JSmol) |
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| 605441 | |||
| ChEBI | |||
| ChEMBL | |||
| ChemSpider | |||
| ECHA InfoCard | 100.003.252 | ||
| EC Number |
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| 101390 | |||
| KEGG | |||
PubChem CID |
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| RTECS number |
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| UNII | |||
| UN number | 1307 | ||
CompTox Dashboard (EPA) |
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| Properties | |||
| C8H10 | |||
| Molar mass | 106.16 g/mol | ||
| Appearance | Colorless liquid | ||
| Odor | Aromatic in high concentrations | ||
| Density | 0.86 g/mL | ||
| Melting point | −48 °C (−54 °F; 225 K) | ||
| Boiling point | 139 °C (282 °F; 412 K) | ||
| does not react with water | |||
| Solubility in ethanol | miscible | ||
| Solubility in diethyl ether | miscible | ||
| Vapor pressure | 9 mmHg (20°C) | ||
| -76.56·10−6 cm3/mol | |||
Refractive index (nD) |
1.49722 | ||
| Viscosity | 0.8059 cP at 0 °C 0.6200 cP at 20 °C | ||
| 0.33-0.37 D | |||
| Hazards | |||
| Occupational safety and health (OHS/OSH): | |||
Main hazards |
Harmful if swallowed. Vapor harmful. Flammable liquid and vapor. | ||
| GHS labelling: | |||
| Danger | |||
| H226, H302, H304, H312, H315, H318, H332 | |||
| P210, P233, P240, P241, P242, P243, P261, P264, P271, P280, P301+P310, P302+P352, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P310, P312, P321, P322, P331, P332+P313, P362, P363, P370+P378, P403+P235, P405, P501 | |||
| NFPA 704 (fire diamond) | |||
| Flash point | 27 °C (81 °F; 300 K) | ||
| 527 °C (981 °F; 800 K) | |||
| Explosive limits | 1.1%-7.0% | ||
Threshold limit value (TLV) |
100 ppm (TWA), 150 ppm (STEL) | ||
| Lethal dose or concentration (LD, LC): | |||
LCLo (lowest published) |
2010 ppm (mouse, 24 hr) 8000 ppm (rat, 4 hr) | ||
| NIOSH (US health exposure limits): | |||
PEL (Permissible) |
TWA 100 ppm (435 mg/m3) | ||
REL (Recommended) |
TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3) | ||
IDLH (Immediate danger) |
900 ppm | ||
| Safety data sheet (SDS) | External MSDS | ||
| Related compounds | |||
Related aromatic hydrocarbons |
benzene toluene o-xylene p-xylene | ||
| Supplementary data page | |||
| M-Xylene (data page) | |||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |||
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