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ISOBUTANE structure
Chemical Name:
r600a;R 600a;i-Butane;Isobutan;methyl-2;ISOBUTANE;iso-C4H10;tert-Butane;Methylpropane;2-METHYLPROANE
Molecular Formula:
Formula Weight:
MOL File:

ISOBUTANE Properties

Melting point:
−160 °C(lit.)
Boiling point:
−12 °C(lit.)
2.064 g/mL at 25 °C(lit.)
vapor density 
2.01 (21 °C, vs air)
vapor pressure 
72.2 psi ( 37.7 °C)
refractive index 
Flash point:
-83 °C
explosive limit
Stable. Extremely flammable. May form explosive mixtures with air.
CAS DataBase Reference
75-28-5(CAS DataBase Reference)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
  • NFPA
Hazard Codes  F+
Risk Statements  12
Safety Statements  9-16
RIDADR  UN 1969 2.1
WGK Germany  -
RTECS  TZ4300000
Autoignition Temperature 860 °F
HazardClass  2.1
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H220 Extremely flammable gas Flammable gases Category 1 Danger P210, P377, P381, P403
H280 Contains gas under pressure; may explode if heated Gases under pressure Compressed gas
Liquefied gas
Dissolved gas
Warning P410+P403
Precautionary statements:
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P377 Leaking gas fire: Do not extinguish, unless leak can be stopped safely.
P403 Store in a well-ventilated place.
P410 Protect from sunlight.

NFPA 704

Diamond Hazard Value Description
1 0
Health   1 Exposure would cause irritation with only minor residual injury (e.g. acetone, sodium bromate, potassium chloride)
Flammability   4 Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Includes pyrophoric substances. Flash point below room temperature at 22.8 °C (73 °F). (e.g. acetylene, propane, hydrogen gas)
Instability   0 Normally stable, even under fire exposure conditions, and is not reactive with water (e.g. helium,N2)

(NFPA, 2010)

ISOBUTANE price More Price(3)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 295450 2-Methylpropane 99% 75-28-5 100g $134 2018-11-20 Buy
Sigma-Aldrich 295450 2-Methylpropane 99% 75-28-5 350g $176 2018-11-20 Buy
Sigma-Aldrich 539821 2-Methylpropane 99.995% 75-28-5 170g $477 2018-11-20 Buy

ISOBUTANE Chemical Properties,Uses,Production

Chemical Properties

colourless odourless gas (or colourless cryogenic liquid)


Organic synthesis, refrigerant, motor fuels, aerosol propellant, synthetic rubber, instrument calibration fluid.


Isobutane occurs in petroleum, natural gas,and petroleum cracking products. It is usedas a fuel gas or a liquefied petroleum gas. Itis also used in organic synthesis.


ChEBI: An alkane that is propane substituted by a methyl group at position 2.

General Description

ISOBUTANE is a colorless gas with a faint petroleum-like odor. ISOBUTANE is shipped as a liquefied gas under its vapor pressure. Contact with the liquid can cause frostbite. ISOBUTANE is easily ignited. The vapors are heavier than air. Any leak can either be liquid or vapor. ISOBUTANE can asphyxiate by the displacement of air. Under prolonged exposure to fire or intense heat the containers may rupture violently and rocket.

Air & Water Reactions

Highly flammable.

Reactivity Profile

ISOBUTANE is incompatible with the following: Strong oxidizers (e.g., nitrates & perchlorates), chlorine, fluorine, (nickel carbonyl + oxygen) .


Highly flammable, dangerous fire and explosive risk; explosive limits in air 1.9–8.5%.

Health Hazard

Central nervous system depression ranging from dizziness and incoordination to anesthesia and respiratory arrest, depending on concentration and extent of inhalation. Irregular heartbeat is rare but is a dangerous complication at anesthetic levels.

Health Hazard

Isobutane, like other saturated aliphatic alkanes,is nontoxic. It is an asphyxiate. Exposureto high concentrations of 1% in air maycause narcosis and drowsiness. Other thanthis, there is no report of any adverse healtheffect from exposure to this gas.

Fire Hazard

EXTREMELY FLAMMABLE. Will be easily ignited by heat, sparks or flames. Will form explosive mixtures with air. Vapors from liquefied gas are initially heavier than air and spread along ground. CAUTION: Hydrogen (UN1049), Deuterium (UN1957), Hydrogen, refrigerated liquid (UN1966) and Methane (UN1971) are lighter than air and will rise. Hydrogen and Deuterium fires are difficult to detect since they burn with an invisible flame. Use an alternate method of detection (thermal camera, broom handle, etc.) Vapors may travel to source of ignition and flash back. Cylinders exposed to fire may vent and release flammable gas through pressure relief devices. Containers may explode when heated. Ruptured cylinders may rocket.

Safety Profile

An asphyxiant. A common air contaminant. A very dangerous fire and explosion hazard when exposed to heat, flame, or oxidizers. To fight fire, stop flow of gas. When heated to decomposition it emits acrid smoke and irritating fumes.

Purification Methods

Olefins and moisture can be removed by passage at 65o through a bed of silica-alumina catalyst which has previously been evacuated at about 400o. Alternatively, water and CO2 can be removed by passage through P2O5, then asbestos impregnated with NaOH. Treatment with anhydrous AlBr3 at 0o then removes traces of olefins. Inert gases can be separated by freezing the isobutane at -195o and evacuating out the system. [Beilstein 1 IV 282.]

ISOBUTANE Preparation Products And Raw materials

Raw materials

Preparation Products


Global( 82)Suppliers
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