ALLURETHANE / Products / Diisocyanate



Diisocyanates used in polyurethane production are divided into two types: aromatic diisocyanates and aliphatic diisocyanates.


There are two primary aromatic diisocyanates: toluene diisocyanate (TDI) and methylenediphenyl diisocyanate (MDI). TDI is used primarily in the production of flexible foams. MDI, the second type of diisocyanate, comes in two forms: Pure MDI and polymeric MDI (PMDI).  Pure MDI is used in the production of a variety of polyurethane products like elastomers, sealants, adhesives and coatings. PMDI is a highly versatile product used to produce a wide variety of rigid, flexible, semi-rigid and polyisocyanurate and thermoset foams.


Aliphatic diisocyanates (ADI) are specialty intermediate chemicals used primarily to make durable coatings, adhesives, sealants and elastomers. Generally, they are considered to be specialty materials used in significantly smaller quantities than the aromatic diisocyanates. In total, ADIs represented less than five percent of overall isocyanate consumption in the North American polyurethane industry*. ADIs are typically not sold directly for consumer use. Rather, they are sold primarily to industrial customers who use them as binders or hardeners during manufacturing processes.


Allurethane supplies various grades of diisocyanates with different purity and functionality, for instance :

  • TDI 80/20
  • TDI 65/35
  • TDI 100
  • Polymeric MDI
  • High functionality MDI
  • Modified MDI
  • Monomeric / Pure MDI
  • Precut MDI
  • IPDI
  • HDI
  • etc…


*ACC Center for the Polyurethanes Industry 2014 End-Use Market Survey


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