p-Xylene

p-Xylene
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General
Common name	p-Xylene
Systematic name	1,4-Dimethylbenzene
Other names	p-Xylol Paraxylene
Chemical formula	C8H10
Molecular mass	106.16 g/mol
Appearance	Clear, colorless liquid colorless crystalline solid
CAS number	106-42-3
Properties
Density and phase	0.87 g/cm³, liquid
Solubility in water	Insoluble
Melting point	12-13 °C
Boiling point	138 °C
Critical temperature	343 °C (616 K)
Viscosity	0.34 cP at 30°C/ 86°F
Dipole moment	0.07 D
Hazards
MSDS	External MSDS
Main hazards	Flammable; Harmful; Irritant
NFPA 704	3 2 0
Flash point	27 °C/ 80.6 °F
R-phrases	R10, R10, R11, R38
S-phrases	S25
RTECS number	ZE2625000
Supplementary data page
Structure & properties	n, εr, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Related compounds
Related aromatic hydrocarbons	benzene toluene o-xylene m-xylene
Except where noted otherwise, data are given for materials in their standard state (at 25°C, 100 kPa) Infobox disclaimer and references

p-Xylene is an aromatic hydrocarbon, based on benzene with two methyl substituents. The “p” stands for para, identifying the location of the methyl groups as across from one another.

It is an isomer of xylene. Other isomers include o-xylene and m-xylene. p-Xylene is used on a large scale for the manufacture of terephthalic acid for polyester. Its polymer is known as parylene.

See also

• XyleneTemplate:Hydrocarbon-stub