CAS No.: 106-42-3 Formula: C8H10 Molecular Weight: 106.16500
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CAS No.: 106-42-3 Formula: C8H10 Molecular Weight: 106.16500
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p-Xylene is an aromatic hydrocarbon based on benzene with two methyl substituents with the chemical formula C8H10 or C6H4(CH3)2. 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. The boiling point of p-xylene is 138.35 °C (281 °F) and the melting point is 13.2 °C (56 °F). p-Xylene is used on a large scale for the manufacture of terephthalic acid for polyester. Its polymer is known as parylene.
p-Xylene is produced by catalytic reforming of petroleum naphtha as part of the BTX aromatics (benzene, toluene and the xylene isomers) extracted from the catalytic reformate. The p-xylene is then separated out in a series of distillation, adsorption or crystallization and reaction processes from the m-xylene, o-xylene and ethylbenzene. Its melting point is the highest among this series of isomers, but simple crystallization does not allow easy purification due to the formation of eutectic mixtures. It is also highly flammable.

Basic Info

Chemical Name p-Xylene

4-methyltoluene; p-methyl-toluene; p-Xylol; 1,4-Dimethylbenzene; para-xylene; 1,4-dimethyl-benzene; Paraxylene; Benzene, 1,4-dimethyl-; p-dimethylbenzene; Expand

CAS No. 106-42-3
Molecular Formula C8H10
Molecular Weight 106.16500
PSA 0.00000
LogP 2.30340

Numbering system

BRN number 1901563
PubChem number 24890185
MDL number MFCD00008556
EINECS number 203-396-5
RTECS number ZE2625000


Appearance & Physical State colourless liquid
Density 0.866
Boiling Point 138ºC
Melting Point 13-13ºC
Flash Point 25ºC
Refractive Index n20/D 1.495(lit.)
Stability Stable. Incompatible with oxidizing agents. Hygroscopic. Flammable.
Storage Condition 0-6ºC
Vapor Pressure 7.943mmHg at 25°C

Safety Info

Safety Statements S25
HS Code 2902430000
Packing Group III
RIDADR UN 1307 3/PG 3
Risk Statements R10; R20/21; R38
Hazard Codes Xn
Hazard Declaration H226; H312 + H332; H315
Caution Statement P210; P261; P280; P370 + P378
Signal Word Warning
Symbol GHS02, GHS07
1H NMR : parameter in CDCl3Expand

NMR Spectrum 1H NMR : parameter in CDCl3


C8 H10 0.02 ml : 0.5 ml CDCl3

Parameter ppm Hz
D(A) 2.296

D(B) 7.046

IR : liquid filmExpand
Mass Expand
Raman : 4880 A,200 M,liquidExpand
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