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Hexamethylene diisocyanate

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Title: Hexamethylene diisocyanate  
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Subject: Polyurethane, HDI, Isocyanate, Advanced composite materials (engineering), Climate of Houston
Collection: Isocyanates
Publisher: World Heritage Encyclopedia

Hexamethylene diisocyanate

Hexamethylene diisocyanate
Hexamethylene diisocyanate
Hexamethylene diisocyanate
CAS number  YesY
ChemSpider  YesY
Jmol-3D images Image 1
Molecular formula C8H12N2O2
Molar mass 168.2 g/mol
Appearance Colourless liquid
Density 1.047 g/cm3, liquid
Melting point −67 °C (−89 °F; 206 K)
Boiling point 255 °C (491 °F; 528 K)
Viscosity 3 cP at 25 °C
Flash point 130–140 °C (Cleveland open cup)
Related compounds
Related isocyanates Isophorone diisocyanate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY   YesY/N?)

Hexamethylene diisocyanate (HDI) is an organic compound in the class known as isocyanates. More specifically, it is an aliphatic diisocyanate. It is produced in relatively small quantities, accounting for (with isophorone diisocyanate) only 3.4% of the global diisocyanate market in the year 2000.[1] Aliphatic diisocyanates are used in special applications, such as enamel coatings which are resistant to abrasion and degradation from ultraviolet light. These properties are particularly desirable in, for instance, the exterior paint applied to aircraft.


  • Synthesis 1
  • Chemistry 2
  • See also 3
  • References 4
  • External links 5


There are two steps to the synthesis of pure HDI:[1]

  • Phosgenation: Reaction of hexamethylene diamine with phosgene to form crude HDI
  • Purification: Distillation of crude HDI to extract pure HDI


HDI is a symmetrical molecule and thus has two isocyanate groups of equal reactivity.

See also


  1. ^ a b Randall, David; Lee, Steve (2002). The Polyurethanes Book. New York: Wiley.  

External links

  • NIOSH Safety and Health Topic: Isocyanates, from the website of the National Institute for Occupational Safety and Health (NIOSH)
  • NIOSH Pocket Guide to Chemical Hazards - Hexamethylene diisocyanate
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