Hexamethylene diisocyanate (HDI)

CAS Number


Last Revised


TWA Limit

0.005 ppm



Ceiling Limit

0.01 ppm

Notes & Notations
Basis of B.C. Exposure Limit
Minimize the potential for:
  • Eye, nose and upper respiratory tract irritation
  • Possible respiratory sensitization
  • Note: There may be other potential health effects; refer to ACGIH TLV Documentation and other relevant references.
If the substance you are searching has an entry that contains a size-selective fraction, form, or work activity, you should perform an additional search to confirm if other exposure limits may apply.

Ensure no workers are exposed to a substance that exceeds the exposure limits in accordance with OHSR 5.48.