CAS 106-42-3: p-Xylene (C8H10)

Identity

CAS Number	106-42-3
Molecular Formula	C8H10
IUPAC Name	1,4-dimethylbenzene
Molecular Weight	106.16 g/mol
SMILES	`Cc1ccc(C)cc1`
Synonyms	para-xylene, p-xylene, 1,4-dimethylbenzene, p-xylol

2D Structure

Physical Properties

Density	0.861 g/mL at 25°C
Boiling Point	138.4°C
Melting Point	13.2°C
Flash Point	27.0°C
Vapor Pressure	0.9 kPa at 20°C
Refractive Index	nD = 1.496
Dielectric Constant	ε = 2.27

Safety & GHS Classification

FlammableIrritantHealth Hazard

H226: Flammable liquid and vapor
H304: May be fatal if swallowed and enters airways
H312: Harmful in contact with skin
H315: Causes skin irritation
H319: Causes serious eye irritation
H332: Harmful if inhaled
H335: May cause respiratory irritation
H373: May cause damage to organs through prolonged or repeated exposure

Storage: Store in well-ventilated area away from heat and ignition sources. Solidifies below 13°C — warm gently to re-melt. Ground/bond containers. Use explosion-proof equipment.

Material Compatibility Matrix

Plastics

Material	Rating
PTFE	Excellent
PVC	Poor
PE	Good
PP	Good
PEEK	Excellent
PVDF	Good

Rubbers

Material	Rating
Viton	Severe Effect
NBR	Severe Effect
EPDM	Severe Effect
Silicone	Poor
FKM	Severe Effect

Metals

Material	Rating
Stainless 316	Excellent
Aluminum	Excellent
Copper	Excellent
Brass	Excellent

Applications

Terephthalic acid precursor (PET bottle resin)
Polyester fiber and film manufacturing
PET plastic bottle production
Solvent for paints, coatings, and adhesives
Dye and pigment intermediate
Pharmaceutical intermediate

External References: PubChem

Related Chemicals

Cyclohexane (C6H12)

hexamethylene, hexanaphthene

Dichloromethane (Methylene Chloride) (CH2Cl2)

methylene chloride, DCM

Tetrahydrofuran (THF) (C4H8O)

THF, oxolane