Toluene diisocyanate

Other Trading Names:

  • TDI
  • Methylbenzene Diisocyanate
  • 2,4-diisocyanato-1-methylbenzene

CAS Number: 584-84-9

HS Code: 2929101000

Types of Packaging:

  • 250 kg/drum
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Toluene diisocyanate

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Chemical Name

Toluene diisocyanate



Molecular Formula


CAS Number



Colorless to pale yellow liquid

Grade Standard

Polyurethane Grade, Industrial Grade


Slightly soluble in water

Melting Point

-30 ºC

Boiling Point

251 ºC


1.214 g/cm³

Chemical Description

  • Toluene Diisocyanate (TDI), often referred to simply as TDI, is a volatile organic compound with the chemical formula C9H6N2O2. It is most commonly available in two isomers: 2,4-TDI and 2,6-TDI, which differ slightly in their chemical structure and properties but are used in similar applications.
  • TDI is a clear, colorless to pale yellow liquid with a sharp, pungent odor. It is characterized by a high boiling point of about 251°C (484°F), making it suitable for high-temperature industrial processes. TDI is slightly soluble in water and reacts with moisture to form carbon dioxide and insoluble ureas.
  • The primary use of Toluene Diisocyanate is in the production of polyurethanes, particularly flexible foams used in furniture, bedding, and automotive applications. Its reactivity with polyols forms polyurethane, which is valued for its excellent cushioning properties.
  • In the coatings industry, TDI is essential for producing polyurethane coatings that offer high durability and resistance to abrasion, solvents, and other environmental factors. These coatings are widely used in automotive, industrial, and marine applications.
  • TDI is also utilized in the manufacture of adhesives and sealants, providing strong bonding and sealing properties required in construction and automotive industries. It enhances the performance and longevity of adhesives used in harsh environments.
  • The elastomer sector benefits from TDI's properties, using it to produce rubber-like materials that retain high flexibility and resilience under stress. These materials are used in tires, gaskets, and seals.
  • Toluene Diisocyanate's high reactivity makes it a crucial ingredient in the production of elastomers and fibers, contributing to materials with high strength and elasticity.
  • Its use in the manufacturing of synthetic fibers contributes to textiles with improved durability and resistance to chemicals and heat.
  • Despite its many applications, TDI must be handled with care due to its toxicity and potential health risks, including respiratory issues and skin irritation. Industrial safety standards are critical when working with TDI to minimize exposure and ensure safe handling procedures.
  • Due to TDI's volatile nature and potential environmental impact, ongoing research aims to develop safer, more sustainable alternatives for industrial applications.
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Toluene diisocyanate