HEXACHLOROBENZENE

Chemical Identification
CAS # 118-74-1
Formula
 

C₆Cl₆

Synonyms
 

HCB; perchlorobenzene; pentachlorophenylchloride; phenyl perchloryl

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
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
Sampler/Sampling media
 
 

 

Bulk Method
Bulk Method
 
 

 

On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
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:
 
 

 

Last Updated Date : 12/31/2020