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{| align="right" border="1" cellspacing="0" cellpadding="3" style="margin: 0 0 0 0.5em; background: #FFFFFF; border-collapse: collapse; border-color: #C0C090;"
{| align="right" border="1" cellspacing="0" cellpadding="3" style="margin: 0 0 0 0.5em; background: #FFFFFF; border-collapse: collapse; border-color: #C0C090;"
! {{chembox header}} | ''p''-Xylene
! {{chembox header}} | ''p''-Xylene
|-
| align="center" colspan="2" | [[Image:P-Xylene skeleton.png]] [[Image:P-Xylene.png|50px]]
|-
! {{chembox header}} | General
|-
|-
| [[Common name]]
| [[Common name]]
| ''p''-Xylene
| ''p''-Xylene
|-
|-
| [[IUPAC Nomenclature|IUPAC name]]
| [[IUPAC nomenclature|Systematic name]]
| 1,4-Dimethylbenzene
| 1,4-Dimethylbenzene
|-
|-
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| C<sub>8</sub>H<sub>10</sub>
| C<sub>8</sub>H<sub>10</sub>
|-
|-
| Molecular weight
| Molecular mass
| 106.16 amu
| 106.16 g/mol
|-
| Appearence
|Clear, colorless liquid<br>colorless crystalline solid
|-
|-
| [[CAS number]]
| [[CAS number]]
| 106-42-3
| 106-42-3
|-
|-
! {{chembox header}} | Properties
⚫
| Boiling point
|-
⚫
| 138°C
| [[Density]] and [[Phase (matter)|phase]]
| 1.096 g/cm³, liquid
|-
| [[Soluble|Solubility]] in [[Water (molecule)|water]]
| Insoluble
|-
⚫
| [[Melting point]]
⚫
| 12-13 °C
|-
⚫
| [[Boiling point]]
⚫
| 138 °C
|-
| [[Critical temperature]]
| 343 °C (616 K)
|-
| [[Viscosity]]
| 0.34 c[[Poise|P]] at 30°C/ 86°F
|-
| [[Dipole#Molecular dipoles|Dipole moment]]
| 0.07 [[Debye|D]]
|-
! {{chembox header}} | Hazards
|-
| [[Material safety data sheet|MSDS]]
| [[P-Xylene chemdata supplement#MSDS sheets|External MSDS]]
|-
| Main [[Worker safety and health|hazard]]s
| Flammable; Harmful; Irritant
|-
| [[NFPA 704]]
| {{ NFPA 704 | Health=2 | Flammability=3 }}
|-
| [[Flash point]]
| 27 °C/ 80.6 °F
|-
| [[List of R-phrases|R-phrases]]
| {{R10}}, {{R10}}, {{R11}}, {{R38}}
|-
| [[List of S-phrases|S-phrases]]
| {{S25}}
|-
| [[RTECS]] number
| ZE2625000
|-
! {{chembox header}} | [[P-Xylene (data page)|Supplementary data page]]
|-
| [[P-Xylene chemdata supplement#Structure and properties|Structure & properties]]
| [[Refractive index|''n'']], [[Dielectric constant|''ε<sub>r</sub>'']], etc.
|-
| [[P-Xylene chemdata supplement#Thermodynamic properties|Thermodynamic data]]
| Phase behaviour<br>Solid, liquid, gas
|-
| [[P-Xylene chemdata supplement#Spectral data|Spectral data]]
| [[UV/VIS spectroscopy|UV]], [[Infrared spectroscopy|IR]], [[NMR spectroscopy|NMR]], [[Mass spectrometry|MS]]
|-
! {{chembox header}} | Related compounds
|-
| Related [[aromatic hydrocarbon|aromatic<br/>hydrocarbons]]
| [[benzene]]<br/>[[toluene]]
|-
| {{chembox header}} | <small>Except where noted otherwise, data are given for<br> materials in their [[standard state|standard state (at 25°C, 100 kPa)]]<br/>[[wikipedia:Chemical infobox|Infobox disclaimer and references]]</small>
|-
|-
⚫
| Melting point
⚫
| 12-13°C
|}
|}


Revision as of 18:36, 1 February 2007

p-Xylene
File:P-Xylene skeleton.png
Allgemein
Common name p-Xylene
Systematic name 1,4-Dimethylbenzene
Other names p-Xylol
Paraxylene
Chemical formula C8H10
Molecular mass 106.16 g/mol
Appearence Clear, colorless liquid
colorless crystalline solid
CAS number 106-42-3
Properties
Density and phase 1.096 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
NFPA 704
safety square
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g. gasolineInstability (yellow): no hazard codeSpecial hazards (white): no code
2
3
Flash point 27 °C/ 80.6 °F
R-phrases Template:R10, Template:R10, Template:R11, Template:R38
S-phrases Template: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
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.

Global demand for p-xylene is around 32 million tonnes in 2006, essentially all of this manufacture going into polyester production for fibres and films (eg PET soft drinks bottles).

p-Xylene includes several molecular structures; only a few are used commercially. It has a variety of uses. In electronics, it's vapor-deposited at low pressure onto circuit boards as a thin, even conformal coating. p-Xylene coating has very high electrical resistivity and resists moisture penetration. It is used as a dielectric in certain high-performance capacitors for precision measurement. It has uses in preserving archival paper.

See also

Template:ChemicalSources


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