p-Xylene

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p-Xylene
Other names	p-Xylol 1,4-Dimethylbenzene
Identifiers
CAS number	[106-42-3]
RTECS number	ZE2625000
SMILES	CC1=CC=C(C)C=C1
Properties
Molecular formula	C8H10
Molar mass	106.16 g/mol
Appearance	Colorless liquid colorless crystalline solid
Density	0.861 g/mL
Melting point	13.2 °C, 286 K, 56 °F
Boiling point	138.35 °C, 412 K, 281 °F
Solubility in water	insoluble
Solubility in ethanol	very soluble
Solubility in diethyl ether	very soluble
Refractive index (nD)	1.49582
Viscosity	0.7385 cP at 0 °C 0.6475 cP at 20 °C
Dipole moment	0.07 D
Hazards
MSDS	External MSDS
MSDS	External MSDS
Main hazards	Harmful or fatal if swallowed. Vapor harmful. Flammable liquid and vapor.
NFPA 704	3 1 0
R-phrases	R10 R20 R21 R36 R38
S-phrases	S25
Flash point	25 °C
Related compounds
Related aromatic hydrocarbons	benzene toluene o-xylene m-xylene
Supplementary data page
Structure and properties	n, εr, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
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.

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