DOT 4B Substances
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Substances approved* for storage and transportation in D.O.T. Specification 4B cylinders include:

bulletDry chemical (extinguishing agent)
bulletPropylene
bulletPropane
* Some restrictions specific to your particular situation may apply. To ensure that the substances you intend to use can be stored/transported in 4B cylinders, we suggest that you verify your intended application with D.O.T.