Melting point :12-13 °C (lit.)
Boiling point :138 °C (lit.)
Density :0.861 g/mL at 20 °C (lit.)
vapor density :3.7 (vs air)
vapor pressure :9 mm Hg ( 20 °C)
refractive index :n20/D 1.495(lit.)
Flash point :77 °F
storage temp. :Store at +5°C to +30°C.
solubility :water: soluble0.2g/L
form :Liquid
pka :>15 (Christensen et al., 1975)
color :Colorless
Relative polarity :0.074
Odor :Like benzene; characteristic aromatic.
explosive limit :1.1-7%(V)
Odor Threshold :0.058ppm
Water Solubility :Miscible with alcohol, ether, acetone, benzene and chloroform. Immiscible with water.
λmax :λ: 294 nm Amax: 1.00
λ: 320 nm Amax: 0.10
λ: 350 nm Amax: 0.05
λ: 380-400 nm Amax: 0.01 Merck :14,10081
BRN :1901563
Henry's Law Constant :16.1 at 45.00 °C, 18.6 at 50.00 °C, 20.3 at 55.00 °C, 23.4 at 60.00 °C, 30.5 at 70.00 °C (static headspace-GC, Park et al., 2004)
Dielectric constant :2.6（20℃）
Exposure limits :TLV-TWA100 ppm (～434 mg/m³) (ACGIH, MSHA, and OSHA); STEL 150 ppm (～651 mg/m³) (ACGIH); ceiling 200 ppm/ 10 min (NIOSH); IDLH 1000 ppm (NIOSH).
Stability :Stable. Incompatible with oxidizing agents. Hygroscopic. Flammable.
InChIKey :URLKBWYHVLBVBO-UHFFFAOYSA-N
LogP :3.16 at 20℃
CAS DataBase Reference :106-42-3(CAS DataBase Reference)
EPA Substance Registry System :p-Xylene (106-42-3)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H226 Flammable liquid and vapour Flammable liquids Category 3 Warning H304 May be fatal if swallowed and enters airways Aspiration hazard Category 1 Danger H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning H412 Harmful to aquatic life with long lasting effects Hazardous to the aquatic environment, long-term hazard Category 3 P273, P501
Precautionary statements:	P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P301+P310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P331 Do NOT induce vomiting.