m-Xylene Standard , StandardforGC,≥99.5%(GC) , 108-38-3
Synonym(s):
m-Xylene;1,3-Dimethylbenzene;m-Xylene
CAS NO.：108-38-3
Empirical Formula: C8H10
Molecular Weight: 106.17
MDL number: MFCD00008536
EINECS: 203-576-3
PRODUCT Properties
| Melting point: | -48 °C (lit.) |
| Boiling point: | 138-139 °C (lit.) |
| Density | 0.868 g/mL at 25 °C (lit.) |
| vapor density | 3.7 (vs air) |
| vapor pressure | 16 mm Hg ( 37.7 °C) |
| refractive index | n |
| Flash point: | 77 °F |
| storage temp. | 2-8°C |
| solubility | Miscible with many organic solvents, including alcohol and ether |
| form | Liquid |
| pka | >15 (Christensen et al., 1975) |
| color | Colorless |
| Odor | Like benzene; characteristic aromatic. |
| explosive limit | 1.1-7%(V) |
| Odor Threshold | 0.041ppm |
| Water Solubility | Miscible with organic solvents. Immiscible with water. |
| Merck | 14,10081 |
| BRN | 605441 |
| Henry's Law Constant | 14.80 at 45.00 °C, 17.26.4 at 50.00 °C, 19.90 at 55.00 °C, 23.01.3 at 60.00 °C, 27.46.3 at 70.00 °C
(static headspace-GC, Park et al., 2004) |
| Exposure limits | NIOSH REL: 100 ppm (435 mg/m3), STEL 150 ppm (655 mg/m3), IDLH 900
ppm; OSHA PEL: TWA 100 ppm; ACGIH TLV: TWA 100 ppm, STEL 150 ppm (adopted). |
| Dielectric constant | 2.3999999999999999 |
| InChIKey | IVSZLXZYQVIEFR-UHFFFAOYSA-N |
| LogP | 3.16 at 20℃ |
Description and Uses
Xylene exists in three isomeric forms, ortho-,meta-, and para-xylene. Commercial xylene is a mixture ofthese three isomers and may also contain ethylbenzene aswell as small amounts of toluene, trimethylbenzene, phenol,thiophene, pyridine, and other nonaromatic hydrocarbons.m-Xylene is predominant in commercial xylene. The physical properties of the three isomers are as follows:Isomer MeltingPoint(℃)BoilingPoint(℃)FlashPoint(℃)LowerExpl.(%)UpperExpl.(%)AutoTemp.(℃)ortho- -25 144 32 0.9 6.7 463meta- -48 139 27 1.1 7.0 527para- 13 138 27 1.1 7.0 528
Meta-Xylene is used for the production of isophthalic acid, of agriculture chemicals as pharmaceuticals. It finds applications in paint and varnish removers and aerosol paint concentrates. Product Data Sheet
Safety
| Symbol(GHS) |    GHS02,GHS07,GHS08 |
| Signal word | Danger |
| Hazard statements | H226-H304-H312+H332-H315-H319-H335-H412 |
| Precautionary statements | P210-P273-P280-P301+P310-P303+P361+P353-P331 |
| Hazard Codes | Xn,T,F |
| Risk Statements | 10-20/21-38-39/23/24/25-23/24/25-11-36/38 |
| Safety Statements | 25-45-36/37-16-7 |
| RIDADR | UN 1307 3/PG 3 |
| OEB | A |
| OEL | TWA: 100 ppm (435 mg/m3), STEL: 150 ppm (655 mg/m3) |
| WGK Germany | 2 |
| RTECS | ZE2275000 |
| Autoignition Temperature | 982 °F |
| TSCA | Yes |
| HazardClass | 3 |
| PackingGroup | II |
| HS Code | 29024200 |
| Toxicity | LD50 orally in rats: 7.71 ml/kg (Smyth) |
