Preservatives & Biocides
REACH
1,4-dichlorobenzene
CAS Number
106-46-7
EC Number
203-400-5
Abbreviation
PDCB
What is 1,4-dichlorobenzene?
1,4-Dichlorobenzene (CAS 106-46-7), commonly sourced as PDCB or para-dichlorobenzene, is an aromatic chlorinated compound used industrially as a biocide, chemical intermediate, and moth-repellent active.
Where is 1,4-dichlorobenzene used?
- Textile and leather processing: moth-proofing agent
- Warehousing and transit: protects stored wool, fur, and natural fiber goods
- Polymer synthesis: key intermediate for polyphenylene sulfide (PPS), used in automotive and electrical components
- Printing and packaging: specialty solvent formulations and carrier systems for pigment dispersion
- Flame retardant production: chemical building block where chlorinated aromatic structures are incorporated into polymer matrices
- Its controlled sublimation profile makes it effective in slow-release preservation and fumigant applications without liquid handling.
Commercial specifications
- Purity typically 99% or higher for industrial use
- Bulk supply in fiber drums or bags; smaller packaged formats for specialty or consumer-adjacent end uses
Other Names (Synonyms)
PDCB|para-dichlorobenzene|p-dichlorobenzol|p-dichlorobenzene|p-dichlorbenzene|p-chlorophenyl chloride|PDB|PARA
What are the physical properties of 1,4-dichlorobenzene?
Melting Point 52.7 °C
Boiling Point 174 °C @ Press: 760 Torr
Density 1.2475 g/cm³ @ Temp: 20 °C
Flash Point 150 °F
Appearance There are three isomeric forms of dichlorobenzene (DCB): m-DCB is a flammable liquid and vapor.
Color White
Odor Aromatic.
Form Crystals
Water Solubility insoluble
Vapor Pressure 1.03 mm Hg ( 25 °C)
Refractive Index 1.5434
pH 7 (0.06g/l, H2O, 20℃)
Log P 3.37 at 25℃ and pH7
How is 1,4-dichlorobenzene classified and handled safely? Learn More
Warning
GHS08· Health Hazard GHS09· Environmental Hazard GHS07· Irritant
Hazard Statements
H303 May be harmful if swallowed
H316 Causes mild skin irritation
H317 May cause an allergic skin reaction
H319 Causes serious eye irritation
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
Which trade and regulatory codes apply to 1,4-dichlorobenzene?
HS Code 29036100
UN Number 3077
ADR Class 9
Packing Group III
Storage Class 11 - Combustible Solids
WGK (Germany) 2