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Terephthaloyl Chloride (TCL)

p-Phthaloyl Chloride

Product Description and Uses

TCL is used as a key component in performance polymers and aramid fibers, where it imparts flame resistance, chemical resistance, temperature stability, light weight, and very high strength. TCL is also an effective water scavenger, used to stabilize isocyanates and urethane prepolymers.

TCL is a clear, water-white liquid above its freezing point and a white crystalline solid at room temperature. Mixes of terephthaloyl chloride (TCL) and isophthaloyl chloride (ICL) are available on request. DuPont offers TCL as white, free-flowing flakes and as a molten liquid in bulk. TCL is soluble in methylene chloride and other organic solvents.


Specifications and other information on TCL are easily obtained by contacting us.

Typical Physical Properties*

Property  Typical Value  
Molecular Weight   203.0 
Boiling Point (760 mmHg), °C (°F)    265 (509) 
Melting Point Range, °C (°F)    81.5-83.0 (179-182) 
Specific Gravity, 100°C (212°F)   1.34  
Vapor Pressure (mmHg) @ 25°C (77°F), solid  0.02   
Vapor Pressure (mmHg) @ 37°C (99°F), solid  0.06   
Vapor Pressure (mmHg) @ 100°C (212°F)  1.8  
Flash Point, SFCC, °C (°F)     180 (356) 













*These properties are drawn from various DuPont and other literature sources. DuPont does not make any warranty, express or implied, that future production will demonstrate these typical properties.

Shipping Information

TCL is available in flake form in steel drums and as a molten liquid in tank trucks.