1,2,4-TRICHLOROBENZENE

Chemical Identification
Chemical Identification
CAS # 120-82-1
Formula
 

C₆H₃Cl₃

Synonyms
 

unsym-trichlorobenzene; 1,2,4-trichlorobenzol

Physical Properties
Physical Properties
Physical description Colorless liquid or crystalline solid (below 63°F) with an aromatic odor.
Boiling point 416°F Molecular weight 181.4
Freezing point/melting point 63°F Vapor pressure 1 mmHg
Flash point 222°F Vapor density 6.26
Specific gravity 1.45 Ionization potential
Lower explosive limit (LEL) 2.5% at 302°F Upper explosive limit (UEL) 6.6% at 302°F
NFPA health rating 2 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.) 2481
Sampling group
Sampler/Sampling media PTFE filter & XAD-2 (100/50 mg) [SKC 225-17A & SKC 226-30-4]
Sampling time*
 

 

Sampling volume (TWA)*
 

3-12 L

Sampling flow rate (TWA)*
 

0.01-0.2 L/min

Sampling volume (STEL/Peak/C)*
 

 

Sampling flow rate (STEL/Peak/C)*
 

 

Analytical method instruments GC
Method reference NIOSH 5517 (fully validated)
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
 

 

PEL-TWA
 

 

PEL-STEL
 

 

REL-STEL
 

 

TLV-STEL
 

 

PEL-STEL
 

 

PEL-C
 

 

REL-C
 

5 ppm (40 mg/m³)

TLV-C
 

5 ppm [1975]

PEL-C
 

5 ppm (40 mg/m³)

Skin notation
 

NA

Skin notation
 

N

Skin notation
 

N

Skin notation
 

N

Notes:
 

Not established

Notes:
 

 

Notes:
 

 

Notes:
 

 

Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: EPA-D 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 - 1,2,4-Trichlorobenzene

NIOSH: Pocket Guide to Chemical Hazards - 1,2,4-Trichlorobenzene

Literature References

 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - 1,2,4-Trichlorobenzene. See annual publication for most recent information.

Last Updated Date : 12/14/2020