# NIOSH Pocket Guide to Chemical Hazards
Octane | CAS 111-65-9
CH3[CH2]6CH3 | RTECS RG8400000
Synonyms & Trade Names n-Octane, normal-Octane | DOT ID & Guide 1262 128
Exposure Limits | NIOSH REL: TWA 75 ppm (350 mg/m3) C 385 ppm (1800 mg/m3) [15-minute]
OSHA PEL†: TWA 500 ppm (2350 mg/m3)
IDLH 1000 ppm [10%LEL] | Conversion 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 73°F and BP at or above 100°F.
Incompatibilities & Reactivities Strong oxidizers
Measurement Methods NIOSH 1500; OSHA 7
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 promptly Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH 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 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, nose; drowsiness; dermatitis; chemical pneumonitis (aspiration liquid); in animals: narcosis
Target Organs Eyes, skin, respiratory system, central nervous system
See also: INTRODUCTION