Chlorine dioxide
10049-04-4 · (OClO)(.) · Alcide · Anthium dioxcide · BlueMAX Pre-Post · BlueMAX Premium EU · CHLORIDE DIOXIDE · Chlorine dioxide · chlorine dioxide air disinfectant · Chlorine dioxide disinfectant · Chlorine Dioxide Sustained Release Granules · Chlorine Dioxide(ClO2) · Chlorine Oxide · Chlorine oxide (ClO2) · Chlorine oxide? · Chlorine(IV) oxide · Chloroperoxyl · Chloryl radical · ClO2 · dioxido-lambda(5)-chloranyl · dioxidochlorine(.) · Dioxo-lambda~5~-chloranyl · DMINE PENTOSE MEDI PLUS · Doxcide 50 · Gladiator Super Dry · Jiajia Gaseous Air Disinfectant · Joyden · Joyden plus · M.C. (Morningcalm) V Zero · Nobda disinfectant · ProVtect Hand Sanitizer · PURE O2 S · PURE O2-S F · Purite · SANI-HEALTH Sanitizer · SFP INC. NVO-2 TOPICAL NAVEL DIP · SFP INC. VO-2 SANITIZING TEAT DIP · SKIN N CLEAN · TBOSEN EMERGENCY STERILIZATION CARD · VIRUS KILL SANITIZER · VIRUS ZERO-F · E926 · Chlorine dioxide · Chlorine dioxideE number E926CAS 10049-04-4
Listed as a flour treatment agent by Canada and the US.
Listed as flour treatment agents (CA, US) · preservatives (US)
- Canada: Flour treatment agent — Health Canada, List of Permitted Flour Treatment Agents (List 2)
- United States: Flour treating agent — FDA, Substances Added to Food: CHLORINE DIOXIDE
- United States: Antimicrobial agent — FDA, Substances Added to Food: CHLORINE DIOXIDE

Chlorine dioxide is a flour bleaching and maturing agent and an antimicrobial for produce washing and water treatment. It is a different substance from chlorine, and behaves differently.
Where it is and isn’t permitted
| Jurisdiction | Status | Scope and limits | Citation |
|---|---|---|---|
| Australia and New Zealand | No listed food uses foundThis site has not matched this substance to any food use on this jurisdiction’s list of authorised food additives. A food additive may be used only in foods that list names. Flavourings, enzymes, processing aids and added nutrients are regulated separately and do not appear on it. | ||
| Canada | Permitted | no numerical limit (good manufacturing practice) In: White flour; Whole wheat flour. Purpose: Flour treatment agent. Limit: Good Manufacturing Practice. | Health Canada, List of Permitted Flour Treatment Agents (List 2), item C.5retrieved 2026-10-17 |
| European Union | No listed food uses foundThis site has not matched this substance to any food use on this jurisdiction’s list of authorised food additives. A food additive may be used only in foods that list names. Flavourings, enzymes, processing aids and added nutrients are regulated separately and do not appear on it. | ||
| Great Britain | No listed food uses foundThis site has not matched this substance to any food use on this jurisdiction’s list of authorised food additives. A food additive may be used only in foods that list names. Flavourings, enzymes, processing aids and added nutrients are regulated separately and do not appear on it. | ||
| Japan | Permitted, with conditions | Designated additive: Appended Table 1, item 292, 二酸化塩素 (“Chlorine Dioxide” in the unofficial English translation). …Designated additive: Appended Table 1, item 292, 二酸化塩素 (“Chlorine Dioxide” in the unofficial English translation). Standards for use — Specifications and Standards for Foods, Food Additives, etc. (MHW Notification No. 370 of 1959), Part II (Food Additives), F (Standards for use), entry 二酸化塩素: (1) [may be used only in the foods stated] “二酸化塩素は、小麦粉以外の食品に使用してはならない。” The Japanese is the standard as published. There is no official English translation of the Notification; the English in square brackets is this site’s description of what each sentence does, not a translation of the foods or the levels. Compositional specifications for this additive, in the same Notification, are not imported and are not shown here; nor are the general rules in F 添加物一般, which apply to every additive. | Regulations for Enforcement of the Food Sanitation Act (MHW Ordinance No. 23 of 1948), Appended Table 1retrieved 2026-10-18 |
| South Korea | Permitted, with conditions | Designated food additive: Standards and Specifications for Food Additives, Part III, 1. …Designated food additive: Standards and Specifications for Food Additives, Part III, 1. 일반식품첨가물 (general food additives), 이산화염소(수) (“Chlorine Dioxide”, the English the Code prints beside it); the Code marks it as also usable as a processing aid; 2. 가공보조제 (processing aids), 이산화염소(수) (“Chlorine Dioxide”, the English the Code prints beside it); the Code marks it as also usable as a general food additive. Main use (주용도) of 이산화염소(수): 밀가루개량제. Standard for use (사용기준) of 이산화염소(수): (1) [may be used only in the foods listed; sets a limit on the amount used] “이산화염소는 아래의 식품에 한하여 사용하여야 한다. 이산화염소의 사용량은 1. 빵류 제조용 밀가루 : 30mg/kg 이하” Main use (주용도) of 이산화염소(수): 살균제. Standard for use (사용기준) of 이산화염소(수): (1) “이산화염소수는 과일류, 채소류 등 식품의 살균 목적에 한하여 사용하여야 하며, 최종식품의 완성 전에 제거하여야 한다.” The Korean is the standard as published. There is no official English translation of the current Code (the English version on MFDS’s website is the 2020 edition and has no legal effect); the English in square brackets is this site’s description of what each sentence does, not a translation of the foods or the levels. Compositional specifications (Part IV) are not imported, nor are the general standards in Part II, which apply to every additive. | Standards and Specifications for Food Additives (식품첨가물의 기준 및 규격), MFDS Notification, Part III (Standards for use, by item)retrieved 2026-10-18 |
| United States | Permitted, with conditions | 21 CFR 173.300retrieved 2026-10-17 | |
| Codex Alimentarius | Not listedDoes not appear on this jurisdiction’s permitted list. That is not the same as being prohibited. |
How much is permitted
A listing usually limits the quantity as well as the food. Only one of the forms that takes is a figure: quantum satis and good manufacturing practice permit the amount the technological effect requires and no more, which is a limit rather than the absence of one. Figures below are the range across every food category this page is listed in, and categories differ between regulators — see how much is permitted.
| Canada | — | 1 GMP |
|---|---|---|
| Japan | — | 1 no quantity stated |
| South Korea | — | 1 no quantity stated |
| United States | — | 1 no quantity stated |
No regulator sets a figure for Chlorine dioxide. That is not an absence of control: where the listing says quantum satis or good manufacturing practice, the quantity is limited to what the effect requires.
What it is made from
Generated on site from sodium chlorite, because it is too unstable to transport. It oxidises rather than chlorinating, so it does not form the same by-products as chlorine.
- Vegan
- Vegetarian
Compare other additives on the dietary indexes.
- CAS registry number
- 10049-04-4
- InChIKey
- OSVXSBDYLRYLIG-UHFFFAOYSA-N
- PubChem
- CID 24870
Every name it appears under
44 recorded names. A label may use any of them.
E number
- E926
CAS registry number
- 10049-04-4
As it appears in regulation
- Chlorine dioxide
Other names
- (OClO)(.)
- Alcide
- Anthium dioxcide
- BlueMAX Pre-Post
- BlueMAX Premium EU
- CHLORIDE DIOXIDE
- Chlorine dioxide
- chlorine dioxide air disinfectant
- Chlorine dioxide disinfectant
- Chlorine Dioxide Sustained Release Granules
- Chlorine Dioxide(ClO2)
- Chlorine Oxide
- Chlorine oxide (ClO2)
- Chlorine oxide?
- Chlorine(IV) oxide
- Chloroperoxyl
- Chloryl radical
- ClO2
- dioxido-lambda(5)-chloranyl
- dioxidochlorine(.)
- Dioxo-lambda~5~-chloranyl
- DMINE PENTOSE MEDI PLUS
- Doxcide 50
- Gladiator Super Dry
- Jiajia Gaseous Air Disinfectant
- Joyden
- Joyden plus
- M.C. (Morningcalm) V Zero
- Nobda disinfectant
- ProVtect Hand Sanitizer
- PURE O2 S
- PURE O2-S F
- Purite
- SANI-HEALTH Sanitizer
- SFP INC. NVO-2 TOPICAL NAVEL DIP
- SFP INC. VO-2 SANITIZING TEAT DIP
- SKIN N CLEAN
- TBOSEN EMERGENCY STERILIZATION CARD
- VIRUS KILL SANITIZER
- VIRUS ZERO-F
Systematic names
- Chlorine dioxide
Hazard reference values
| Type | Value | Population | Assessed by | Opinion |
|---|---|---|---|---|
| TDI | 0.03 mg/kg bw/day | consumers | EFSA AFC | 2006 |
Evidence and how bodies read it
Studies, and the differing conclusions regulators drew from them, are curated rather than machine-read, and none has been written for this substance yet.
Common questions
Assembled from what is above, in the words the questions are usually asked in. Each answer is the same statement the relevant section makes, with the same citations behind it.
- What is E 926?
- E 926 is Chlorine dioxide. Chlorine dioxide is a flour bleaching and maturing agent and an antimicrobial for produce washing and water treatment. It is a different substance from chlorine, and behaves differently.
- What is Chlorine dioxide used for in food?
- It is listed as a flour treatment agent — the role Canada and the US assign it. This page shows every function each regulator records, with the citation for each.
- Is Chlorine dioxide banned in Europe?
- No. Chlorine dioxide does not appear on the EU's list of authorised food additives, which is not the same as being banned: the EU permits an additive only where it has authorised it, and usually the reason for an absence is that no one applied. The EU has made no finding against this substance. It does mean it may not be used as a food additive in the EU today.
- Where is Chlorine dioxide permitted?
- Of the seven regulators this site reads, Canada, Japan, South Korea and the US permit it. Each permission is for named foods at named levels, not a blanket one; the table on this page gives them with citations.
- Is Chlorine dioxide vegan?
- Yes. Chlorine dioxide is not derived from animals, and is suitable for vegetarians. This page says what it is made from and how.
Sources for this page
- ca retrieved 2026-10-17
- jp retrieved 2026-10-18
- kr retrieved 2026-10-18
- ecfr retrieved 2026-10-17
Full licence terms and publisher details on Sources. How this page is built and updated: Method.
Machine-readable: a JSON record of this additive is given on request —how to ask for access.
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