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n-Pentane

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Synonyms & Trade Names
Pentane, normal-Pentane
CAS No.
109-66-0
RTECS No.
RZ9450000
DOT ID & Guide
1265 128
Formula
CH₃[CH₂]₃CH₃
Conversion
1 ppm = 2.95 mg/m3
IDLH
1500 ppm [10%LEL]
See: 109660
Exposure Limits
NIOSH REL
TWA 120 ppm (350 mg/m3) C 610 ppm (1800 mg/m3) [15-minute]
OSHA PEL
TWA 1000 ppm (2950 mg/m3) See Appendix G
Measurement Methods
NIOSH 1500;
OSHA 7
See: NMAM or OSHA Methods
Physical Description
Colorless liquid with a gasoline-like odor. [Note: A gas above 97°F. May be utilized as a fuel.]
Molecular Weight
72.2
Boiling Point
97°F
Freezing Point
-202°F
Solubility
0.04%
Vapor Pressure
420 mmHg
Ionization Potential
10.34 eV
Specific Gravity
0.63
Flash Point
-57°F
Upper Explosive Limit
7.8%
Lower Explosive Limit
1.5%
Class IA Flammable Liquid: Fl.P. below 73°F and BP below 100°F.
Incompatibilities & Reactivities
Strong oxidizers
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
irritation eyes, skin, nose; dermatitis; chemical pneumonitis (aspiration liquid); drowsiness; In Animals: narcosis
Target Organs
Eyes, skin, respiratory system, central nervous system
Personal Protection/Sanitation
(See protection codes)
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:Water wash promptly
Breathing:Respiratory support
Swallow:Medical attention immediately
Respirator Recommendations

NIOSH

Up to 1200 ppm:
(APF = 10) Any supplied-air respirator

Up to 1500 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

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0534
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health