1. OSHA Occupational Chemical Database
  2. HEXACHLOROBENZENE
Label abbreviations descriptions

HEXACHLOROBENZENE

Chemical Identification
Chemical Identification
CAS # 118-74-1
Formula
 

C₆Cl₆
Synonyms
 

HCB; perchlorobenzene; pentachlorophenylchloride; phenyl perchloryl
Physical Properties
Physical Properties
Physical description A white crystalline substance.
Boiling point 612°F Molecular weight 284.78
Freezing point/melting point 441-444°F Vapor pressure 1 mmHg at 237.9°F
Flash point 468°F Vapor density 9.8
Specific gravity 2.044 at 75.2°F Ionization potential
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating 1 NFPA fire rating 1
NFPA reactivity rating 0 NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.)
Sampling group
Sampler/Sampling media
Sampling time*
Sampling volume (TWA)*
Sampling flow rate (TWA)*
Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments
Method reference
Notes
Special requirements

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Wipe Method
Sampler/Sampling media
 
 

 
Bulk Method
Bulk Method
 
 

 
On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
Exposure Limits
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA
 
 

 

 REL-TWA
 
 

 

 TLV-TWA
 
 

0.002 mg/m³ [1994]

 PEL-TWA
 
 

0.002 mg/m³
PEL-STEL
 
 

 

 REL-STEL
 
 

 

 TLV-STEL
 
 

 

 PEL-STEL
 
 

 
PEL-C
 
 

 

 REL-C
 
 

 

 TLV-C
 
 

 

 PEL-C
 
 

 
Skin notation
 
 

NA

 Skin notation
 
 

NA

 Skin notation
 
 

Y

 Skin notation
 
 

Y
Notes:
 
 

Not established

 Notes:
 
 

Not established

 Notes:
 
 

 

 Notes:
 
 

 
Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: IARC-2B, NTP-R, TLV-A3, EPA-B2 Notes:
 
 

 
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 
 

 
Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Hexachlorobenzene

NIOSH: Pocket Guide to Chemical Hazards - Hexachlorobenzene

Literature References

 
 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Hexachlorobenzene. See annual publication for most recent information.
  • Agency for Toxic Substances and Disease Registry (ATSDR): Toxicological profile for hexachlorobenzene. Atlanta: ATSDR, 2002, 357 pp.
  • EPA Air Toxics Website: Hexachlorobenzene. U.S. Environmental Protection Agency Technology Transfer Network.
  • Pohanish, R.P. (editor): Hexachlorobenzene. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 1. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 1234-1236.

Last Updated Date : 12/31/2020