NIOSH Pocket Guide to Chemical Hazards


CAS 74-98-6


RTECS TX2275000
Synonyms & Trade Names
Bottled gas, Dimethyl methane, n-Propane, Propyl hydride
DOT ID & Guide
1075 115
1978 115


NIOSH REL: TWA 1000 ppm (1800 mg/m3)
OSHA PEL: TWA 1000 ppm (1800 mg/m3)
IDLH 2100 ppm [10%LEL] See: 74986 Conversion 1 ppm = 1.80 mg/m3
Physical Description
Colorless, odorless gas. [Note: A foul-smelling odorant is often added when used for fuel purposes. Shipped as a liquefied compressed gas.]
MW: 44.1
BP: -44°F
FRZ: -306°F
Sol: 0.01%
VP(70°F): 8.4 atm
IP: 11.07 eV
RGasD: 1.55

Fl.P: NA (Gas)
UEL: 9.5%
LEL: 2.1%

Flammable Gas
Incompatibilities & Reactivities
Strong oxidizers
Measurement Methods
NIOSH S87 (II-2); OSHA PV2077
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: Frostbite
Eyes: Frostbite
Wash skin: No recommendation
Remove: When wet (flammable)
Change: No recommendation
Provide: Frostbite wash
First Aid (See procedures)
Eye: Frostbite
Skin: Frostbite
Breathing: Respiratory support

Important additional information about respirator selection
Respirator Recommendations NIOSH/OSHA
Up to 2100 ppm:
(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: Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin and/or eye contact (liquid)
Symptoms Dizziness, confusion, excitation, asphyxia; liquid: frostbite
Target Organs central nervous system
See also: INTRODUCTION   See ICSC CARD: 0319