NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005




Synonyms & Trade Names

n-Octane, normal-Octane
DOT ID & Guide
1262 / 128


NIOSH REL: TWA 75 ppm (350 mg/m3) C 385 ppm (1800 mg/m3) [15-minute]
OSHA PEL: TWA 500 ppm (2350 mg/m3)
1000 ppm [10%LEL] See: 111659
1 ppm = 4.67 mg/m3
Physical Description
Colorless liquid with a gasoline-like odor.
MW: 114.2
BP: 258°F
FRZ: -70°F
Sol(77°F): 0.00007%
VP: 10 mmHg
IP: 9.82 eV

Sp.Gr: 0.70
Fl.P: 56°F
UEL: 6.5%
LEL: 1.0%

Class IB Flammable Liquid: Fl.P. below 73F and BP at or above 100F.
Incompatibilities & Reactivities

Strong oxidizers
Measurement Methods
NIOSH 1500; OSHA 7
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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 promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
Up to 750 ppm:
(APF = 10) Any supplied-air respirator*
Up to 1000 ppm:
(APF = 25) Any supplied-air respirator 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
(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
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Irritation eyes, nose; drowsiness; dermatitis; chemical pneumonitis (aspiration liquid); in animals: narcosis
Target Organs
Eyes, skin, respiratory system, central nervous system
See also: INTRODUCTION   See ICSC CARD: 0933