Hexamethylene diisocyanate

Hexamethylene diisocyanate (HDI) is the organic compound with the formula (CH2)6(NCO)2. It is classified as an diisocyanate. It is a colorless liquid. It has sometimes been called HMDI but this not usually done to avoid confusion with Hydrogenated MDI.

Hexamethylene diisocyanate
Names
Preferred IUPAC name
1,6-Diisocyanatohexane
Other names
HDI
1,6-hexane diisocyanate
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.011.350
PubChem CID
UNII
  • InChI=1S/C8H12N2O2/c11-7-9-5-3-1-2-4-6-10-8-12/h1-6H2 Y
    Key: RRAMGCGOFNQTLD-UHFFFAOYSA-N Y
  • InChI=1/C8H12N2O2/c11-7-9-5-3-1-2-4-6-10-8-12/h1-6H2
    Key: RRAMGCGOFNQTLD-UHFFFAOYAI
SMILES
  • O=C=N\CCCCCC/N=C=O
Properties
C8H12N2O2
Molar mass 168.2 g/mol
Appearance Colourless liquid
Odor sharp, pungent
Density 1.047 g/cm3, liquid
Melting point −67 °C (−89 °F; 206 K)
Boiling point 255 °C (491 °F; 528 K)
Vapor pressure 0.05 mmHg (25 °C)
Viscosity 3 cP at 25 °C
Hazards
Flash point 130–140 °C (266–284 °F; 403–413 K) (Cleveland open cup)
NIOSH (US health exposure limits):
PEL (Permissible)
 none
REL (Recommended)
 TWA 0.005 ppm (0.035 mg/m3) C 0.020 ppm (0.140 mg/m3) [10-minute]
IDLH (Immediate danger)
 N.D.
Related compounds
Related isocyanates
 Isophorone diisocyanate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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