Basic information Xylene Precision Distillation for separation of O-xylene and p-xylene Chemical properties Uses Production method Category Toxicity grading Acute toxicity EXPLOSIVES and HAZARDOUS CHARACTERISTICS Flammability and Hazardous characteristics Storage and transportation characteristics Fire extinguishing agent Occupational Standard Safety Related Supplier
o-Xylene Structure

o-Xylene

Chemical Properties

Melting point -26--23 °C (lit.)
Boiling point 143-145 °C (lit.)
Density  0.879 g/mL at 20 °C (lit.)
vapor density  3.7 (vs air)
vapor pressure  <0.1 atm ( 21.1 °C)
refractive index  n20/D 1.505(lit.)
Flash point 90 °F
storage temp.  Store below +30°C.
solubility  water: partially soluble0.1705 g/L at 25°C
form  Solid or Crystalline Powder
pka >15 (Christensen et al., 1975)
color  Yellow to beige
Odor Benzene-like; characteristic aromatic.
explosive limit 1.0-7.6%(V)
Odor Threshold 0.38ppm
Water Solubility  Sparingly soluble in water. (0.2g/L)
λmax λ: 288 nm Amax: 1.00
λ: 300 nm Amax: 0.40
λ: 325 nm Amax: 0.05
λ: 350-400 nm Amax: 0.01
Merck  14,10081
BRN  1815558
Henry's Law Constant 14.0 at 45.00 °C, 16.4 at 50.00 °C, 19.0 at 55.00 °C, 21.3 at 60.00 °C, 26.3 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 2.5699999999999998
Stability Stable. Incompatible with oxidizing agents. Flammable. Hygroscopic.
InChIKey CTQNGGLPUBDAKN-UHFFFAOYSA-N
LogP 3.16 at 20℃
CAS DataBase Reference 95-47-6(CAS DataBase Reference)
NIST Chemistry Reference Benzene, 1,2-dimethyl-(95-47-6)
EPA Substance Registry System o-Xylene (95-47-6)

Safety Information

Hazard Codes  Xn,T,F
Risk Statements  10-20/21-38-39/23/24/25-23/24/25-11
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  ZE2450000
Autoignition Temperature 867 °F
TSCA  Yes
HazardClass  3
PackingGroup  II
HS Code  29024100
Hazardous Substances Data 95-47-6(Hazardous Substances Data)
Toxicity Acute oral LD50 in rats is approximately 5 g/kg (quoted, RTECS, 1992).
IDLA 900 ppm

MSDS

Usage And Synthesis

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