Comparing E943A - Butane vs E943B - Isobutane

How do the global warming potentials of isobutane?

Isobutane (R-600a) has a very low GWP—about 3 over 100 years and roughly 10 over 20 years (values vary slightly by IPCC assessment). That’s far lower than many HFC propellants, and its ozone-depletion potential is 0.

What is isobutane used for?

As food additive E943b, it’s used as a propellant/expellant gas in aerosols like whipped cream and cooking sprays. Beyond foods, it’s also used as a refrigerant (R-600a), a fuel for lighters/camping stoves, and a foam-blowing agent.

What is the difference between butane and isobutane?

They’re structural isomers: n-butane (E943a) is straight-chain, while isobutane (E943b) is branched. Isobutane’s lower boiling point gives higher vapor pressure and better cold-weather performance; both are highly flammable gases used as propellants.

How do global warming potentials of isobutane?

On a 100‑year basis, isobutane’s GWP is about 3; on a 20‑year basis it’s roughly 10, depending on the IPCC report cited. These values are very low compared with common HFC propellants, and its ODP is 0.

How long do isobutane canisters last?

Run time depends on canister size and stove output; a typical 230 g canister fuels about 1.5–3 hours at moderate heat (less in cold or high power). Unopened canisters keep for many years if stored cool and dry; always follow the manufacturer’s guidance.