1. OSHA Occupational Chemical Database
  2. 2,3-DIMETHYLBUTANE
Label abbreviations descriptions

2,3-DIMETHYLBUTANE

Chemical Identification
Chemical Identification
CAS # 79-29-8
Formula
 

C₆H₁₄
Synonyms
 

diethylmethylmethane; diisopropyl; 2,2-dimethylbutane; 2,3-dimethylbutane; isohexane; 2-methylpentane; 3-methylpentane
Physical Properties
Physical Properties
Physical description Clear liquids with mild, gasoline-like odors.
Boiling point 136.4°F Molecular weight 86.18
Freezing point/melting point -199.3°F Vapor pressure 200 mmHg at 70°F
Flash point -20°F Vapor density 3
Specific gravity 0.6616 Ionization potential
Lower explosive limit (LEL) 1.2% Upper explosive limit (UEL) 7%
NFPA health rating 1 NFPA fire rating 3
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
 

100 ppm (350 mg/m³)

 TLV-TWA
 

500 ppm [1979]

 PEL-TWA
 

500 ppm (1800 mg/m³)
PEL-STEL
 

 

 REL-STEL
 

 

 TLV-STEL
 

1000 ppm [1979]

 PEL-STEL
 

1000 ppm (3600 mg/m³)
PEL-C
 

 

 REL-C
 

510 ppm (1800 mg/m³) [15 minutes]

 TLV-C
 

 

 PEL-C
 

 
Skin notation
 

NA

 Skin notation
 

N

 Skin notation
 

N

 Skin notation
 

N
Notes:
 

Not established

 Notes:
 

 

 Notes:
 

 

 Notes:
 

as Hexane, other isomers
Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: 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 - 2,3-Dimethylbutane

NIOSH: Pocket Guide to Chemical Hazards - Hexane isomers (excluding n-Hexane)

Literature References

 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Hexane isomers, other than n-Hexane. See annual publication for most recent information.

Last Updated Date : 12/15/2020