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Hexane isomers (excluding n-Hexane)

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Synonyms & Trade Names
Diethylmethylmethane, Diisopropyl, 2,2-Dimethylbutane, 2,3-Dimethylbutane, Isohexane, 2-Methylpentane, 3-Methylpentane [Note: Also see specific listing for n-Hexane.]
CAS No.
RTECS No.
DOT ID & Guide
1208 128
Formula
C₆H₁₄
Conversion
1 ppm = 3.53 mg/m3
IDLH
N.D.
See: IDLH INDEX
Exposure Limits
NIOSH REL
TWA 100 ppm (350 mg/m3) C 510 ppm (1800 mg/m3) [15-minute]
OSHA PEL
none See Appendix G
Measurement Methods
None available
See: NMAM or OSHA Methods
Physical Description
Clear liquids with mild, gasoline-like odors. [Note: Includes all the isomers of hexane except n-hexane.]
Molecular Weight
86.2
Boiling Point
122-145°F
Freezing Point
-245 to -148°F
Solubility
Insoluble
Vapor Pressure
?
Ionization Potential
?
Specific Gravity
0.65-0.66
Flash Point
-54 to 19°F
Upper Explosive Limit
?
Lower Explosive Limit
?
Class IB Flammable Liquids
Incompatibilities & Reactivities
Strong oxidizers
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
irritation eyes, skin, respiratory system; headache, dizziness; nausea; chemical pneumonitis (aspiration liquid); dermatitis
Target Organs
Eyes, skin, respiratory system, central nervous system
Personal Protection/Sanitation
(See protection codes)
Skin:Prevent skin contact
Eyes:Prevent eye contact
Wash skin:When contaminated
Remove:When wet (flammable)
Change:No recommendation
First Aid
(See procedures)
Eye:Irrigate immediately
Skin:Soap wash immediately
Breathing:Respiratory support
Swallow:Medical attention immediately
Respirator Recommendations

NIOSH

Up to 1000 ppm:
(APF = 10) Any supplied-air respirator*

Up to 2500 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode*

Up to 5000 ppm:
(APF = 50) Any supplied-air respirator that has a tight-fitting facepiece and is operated in a continuous-flow mode*
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece

Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus

Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

See also
INTRODUCTION
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health