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Isobutane																				Related Pages
Synonyms & Trade Names
			2-Methylpropane
					[Note: Also see specific listing for n-Butane.]
CAS No.
			75-28-5
	RTECS No.
			TZ4300000
	DOT ID & Guide
			1075 1151969 115

FormulaCH3CH(CH3)2
	Conversion
			1 ppm = 2.38 mg/m3
	IDLH
			N.D.See: IDLH INDEX

Exposure Limits
			NIOSH RELTWA 800 ppm (1900 mg/m3)
					OSHA PEL none See Appendix G
	Measurement Methods
			None available 
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless gas with a gasoline-like or natural gas odor.
					[Note: Shipped as a liquefied compressed gas. A liquid below 11°F.]													
										
Molecular Weight58.1	
	Boiling Point11°F
	Freezing Point-255°F
	SolubilitySlight
	Vapor Pressure(70°F): 3.1 atm
	Ionization Potential10.74 eV											
Flash PointNA (Gas)
	Upper Explosive Limit8.4%
	Lower Explosive Limit1.6%
	Relative Gas Density2.06
Flammable Gas
Incompatibilities & Reactivities
			Strong oxidizers (e.g., nitrates & perchlorates), chlorine, fluorine, (nickel carbonyl + oxygen)
Exposure Routes
			inhalation, skin and/or eye contact (liquid)
Symptoms
			drowsiness, narcosis, asphyxia; liquid: frostbite
Target Organs
			central nervous system
										
Personal Protection/Sanitation
			(See protection codes) **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
Respirator Recommendations
			Not available.
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0901

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
Introduction
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Chemical Names, Synonyms and Trade Names
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CAS Numbers
RTECS Numbers
Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
First Aid Procedures Follow NIOSH Facebook
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