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106-42-3

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Identification

Name
P-XYLENE
CAS
106-42-3
Synonyms
1,4-DIMETHYLBENZENE
1,4-Xylene p-Xylene
'LGC' (2031)
PARA-XYLENE
P-XYLENE
1,4-dimethyl-benzen
1,4-Xylene
4-Methyltoluene
4-xylene
ai3-52255
Benzene, 1,4-dimethyl-
Benzene,1,4-dimethyl-
p-Dimethylbenzene
p-Methyltoluene
p-Xylol
Scintillar
xylene(non-specificname)
P-XYLENE, STANDARD FOR GC
P-XYLENE, 99+%, HPLC GRADE
P-XYLENE, ANHYDROUS, 99+%
EINECS(EC#)
203-396-5
Molecular Formula
C8H10
MDL Number
MFCD00008556
Molecular Weight
106.17
MOL File
106-42-3.mol

Chemical Properties

Appearance
colourless liquid
mp 
12-13 °C(lit.)

bp 
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.)

Fp 
77 °F

storage temp. 
0-6°C
Stability:
Stable. Incompatible with oxidizing agents. Hygroscopic. Flammable.
Merck 
14,10081
BRN 
1901563
CAS DataBase Reference
106-42-3(CAS DataBase Reference)

Safety Data

Hazard Codes 
Xn,T
Risk Statements 
R10:Flammable.
R20/21:Harmful by inhalation and in contact with skin .
R38:Irritating to the skin.
R39/23/24/25:Toxic: danger of very serious irreversible effects through inhalation, in contact with skin and if swallowed .
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed .
Safety Statements 
S25:Avoid contact with eyes .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S36/37:Wear suitable protective clothing and gloves .
RIDADR 
UN 1307 3/PG 3

WGK Germany 
2

RTECS 
ZE2625000

HazardClass 
3
PackingGroup 
III
HS Code 
29024300
Safety Profile
Moderately toxic by intraperitoneal route. Mildly toxic by ingestion and inhalation. An experimental teratogen. Experimental reproductive effects. May be narcotic in hgh concentrations. Chronic toxicity not established, but is less toxic than benzene. A very dangerous fire hazard when exposed to heat or flame; can react with oxidzing materials. Explosive in the form of vapor when exposed to heat or flame. To fight fire, use foam, CO2, dry chemical. Potentially explosive reaction with acetic acid + air, 1,3-dichloro-5,5-dimethyl-2,4- imidazolidinhone, nitric acid + pressure. When heated to decomposition it emits acrid smoke and irritating fumes. See also other xylene entries.

Raw materials And Preparation Products

Hazard Information

General Description
A colorless watery liquid with a sweet odor. Less dense than water. Insoluble in water. Irritating vapor. Freezing point is 56°F.
Reactivity Profile
P-XYLENE(106-42-3) may react with oxidizing materials. . Acetic acid forms explosive mixtures with P-XYLENE(106-42-3) and air (Shraer, B.I. 1970. Khim. Prom. 46(10):747-750.).
Air & Water Reactions
Highly flammable. Insoluble in water.
Health Hazard
Vapors cause headache and dizziness. Liquid irritates eyes and skin. If taken into lungs, causes severe coughing, distress, and rapidly developing pulmonary edema. If ingested, causes nausea, vomiting, cramps, headache, and coma. Can be fatal. Kidney and liver damage can occur.
Fire Hazard
Behavior in Fire: Vapor is heavier than air and may travel considerable distance to a source of ignition and flash back.

Material Safety Data Sheet(MSDS)

msds information
1,4-xylene(106-42-3).msds

Questions And Answer

Description
p-xylene is an aromatic hydrocarbon based on benzene with two methyl substituents with the chemical formula C8H10 or C6H4(CH3)2. It is one of the three isomers of dimethylbenzene known collectively as xylenes. The “p” stands for para, identifying that he two methyl groups in p-xylene occupy the diametrically opposite substituent positions 1 and 4. p-Xylene is a colorless, flammable liquid practically insoluble in water. p-Xylene is a colorless watery liquid with a sweet odor and is dangerously flammable, with a flash point of 27°C. p-Xylene is widely used as a feedstock (or “building block”) to manufacture other industrial chemicals, notably terephthalic acid (TPA), purified terephthalic acid (PTA) and dimethyl-terephthalate (DMT). It also may be polymerised directly to produce parylene.
References
1.https://en.wikipedia.org/wiki/P-Xylene
2.https://pubchem.ncbi.nlm.nih.gov/compound/p-xylene#section=Top
3.https://www.chemicalsafetyfacts.org/paraxylene/

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