General Information
Isobutane is a colorless, flammable liquified gas with a faint odor. It can be a simple asphyxiant.

Technical Information

CAS number	75-28-5
Molecular weight	58.124
Specific volume	6.5cf/lb.
CGA valve	510
Lecture bottle valve	180/110

Shipping Information

Proper shipping name	Isobutane
DOT Class	2.1
UN number	1969
DOT label	Flammable Gas

Purity	Cylinder Size	Volume	Pressure
			(@70°F)
99.0%	Lecture bottle	0.4 lbs.	31
99.5%	L04	12 lbs.	31
	L20	23 lbs.	31
	110	116 lbs.	31
	454	490 lbs.	31

Product Specifications

Assay:	99.0%	99.5%	99.98%	99.99%
Impurities:
Methane	<500	<100	<2	<2
Ethane	<1500	<250	<5	<5
Propane	<2500	<1000	<5	<5
N-Butane	<3000	<2500	<150	<10
Pentanes	<1500	<1000	<15	<5
Sulfur	<1	<1	<1	<1
Moisture	<5	<3	<2	<2
Total Impurities:	<1%	<5,000	<200	<100

Liquid Phase
All impurities listed measured in PPM.
All products here are sold on the basis of total impurities.
Impurities may vary slightly. Customer is contacted if specific impurity is higher than typical.
All measurements are ppm weight unless otherwise stated.