E943bIsobutane

E943b is Isobutane. INS 943b is not in Appendix 1 of Circular 24/2019/TT-BYT, so this page does not yet state a Vietnamese rule for it.

Did you know? Isobutane can be made by catalytic isomerisation of n-butane, or by catalytic synthesis from synthesis gas or from CO2 (literature cited by EFSA).

Code: E943b · INS 943b
Group: Propellant

In VietnamNot on Vietnam's list of permitted additivesNot on Vietnam's list of permitted additives (Circular 24/2019); it may be used only in a product whose declaration is registered with the Vietnam Food Administration

Risk level on the Yenzo Scalevery low?Based on the Open Food Facts additives taxonomy

How E943b appears on labels

IngredientsIllustrative example

Wheat flour, vegetable oil, salt, sugar, propellant (943b), dried onion and garlic, pepper, natural colour (160a).

propellant (943b)propellant 943bE943bINS 943b

Isobutane in food

Vegetable oil pan spray (professional use only)

Water-based emulsion spray

Food colour preparations of groups II and III (max 1 mg/kg in final food)

Questions about isobutane

What is E943b (isobutane)?

In Yenzo's data, E943b (INS 943b) is Isobutane.

Is isobutane harmful?

In 2025 EFSA re-evaluated butane, isobutane and propane together. Based on their physicochemical properties, EFSA considered all three gases of low concern as additives with very low dietary exposure, and concluded that their use at the currently permitted uses and use levels does not raise a safety concern.

Is E943b permitted in Vietnam?

INS 943b was not found in Appendix 1 of Circular 24/2019/TT-BYT (consolidated 09/VBHN-BYT). The page draws no conclusion on the rule for E943b.

Other propellants

E290Carbon dioxidevery low E941Nitrogenvery low E942Nitrous oxidevery low E943aButanevery low E944Propanevery low

See all propellants →

Updated 21 October 2026

How Yenzo scores

Sources (3)

Open Food Facts additives taxonomy (Yenzo's table cites no EFSA opinion for this code). Open Food Facts additives taxonomy, https://github.com/openfoodfacts/openfoodfacts-server/blob/main/taxonomies/additives.txt (entry en:e943b)
Thông tư 24/2019/TT-BYT (văn bản hợp nhất 09/VBHN-BYT), Phụ lục 1
EFSA Journal (2025). Re-evaluation of butane (E 943a), isobutane (E 943b) and propane (E 944) as food additives

Information only, not medical advice. The risk level is the additive's class in Yenzo's open scoring method, based on the cited source.