# NIOSH Pocket Guide to Chemical Hazards
n-Heptane | CAS 142-82-5
CH3[CH2]5CH3 | RTECS MI7700000
Synonyms & Trade Names Heptane, normal-Heptane | DOT ID & Guide 1206 128
Exposure Limits | NIOSH REL: TWA 85 ppm (350 mg/m3) C 440 ppm (1800 mg/m3) [15-minute]
OSHA PEL†: TWA 500 ppm (2000 mg/m3)
IDLH 750 ppm | Conversion 1 ppm = 4.10 mg/m3
Physical Description Colorless liquid with a gasoline-like odor.
MW: 100.2 | BP: 209°F | FRZ: -131°F | Sol: 0.0003%
VP(72°F): 40 mmHg | IP: 9.90 eV |  | Sp.Gr: 0.68
Fl.P: 25°F | UEL: 6.7% | LEL: 1.05% |
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 chemical cartridge respirator with organic vapor cartridge(s)/(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister/(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)/(APF = 10) Any supplied-air respirator/(APF = 50) Any self-contained breathing apparatus 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 Dizziness, stupor, incoordination; loss of appetite, nausea; dermatitis; chemical pneumonitis (aspiration liquid); unconsciousness
Target Organs Skin, respiratory system, central nervous system
See also: INTRODUCTION See ICSC CARD: 0657