NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

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 See: 142825
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 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
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
Important additional information about respirator selection
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