NIOSH Pocket Guide to Chemical Hazards

Hexane isomers (excluding n-Hexane) CAS
Synonyms & Trade Names
Diethylmethylmethane; Diisopropyl; 2,2-Dimethylbutane; 2,3-Dimethylbutane; Isohexane; 2-Methylpentane; 3-Methylpentane [Note: Also see specific listing for n-Hexane.]
DOT ID & Guide
1208 128
NIOSH REL: TWA 100 ppm (350 mg/m3) C 510 ppm (1800 mg/m3) [15-minute]
OSHA PEL†: none
IDLH N.D. Conversion 1 ppm = 3.53 mg/m3
Physical Description
Clear liquids with mild, gasoline-like odors. [Note: Includes all the isomers of hexane except n-hexane.]
MW: 86.2
BP: 122-145°F
FRZ: -245 to -148°F
Sol: Insoluble
VP: ?
IP: ?

Sp.Gr: 0.65-0.66
Fl.P: -54 to 19°F
UEL: ?
LEL: ?

Class IB Flammable Liquids
Incompatibilities & Reactivities
Strong oxidizers
Measurement Methods
None available
Personal Protection & Sanitation
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
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