Chlorine dioxide

CAS 10049-04-4

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

Status of Chlorine dioxide by jurisdiction. Every jurisdiction this site covers is listed, including those where the substance does not appear.
JurisdictionStatusScope and limitsCitation
United StatesFood and Drug AdministrationPermitted, with conditions21 CFR 173.300retrieved 2026-09-07
Codex AlimentariusCodex Alimentarius Commission / JECFANot listedDoes not appear on this jurisdiction’s permitted list. That is not the same as being prohibited.

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
CAS registry number
10049-04-4
InChIKey
OSVXSBDYLRYLIG-UHFFFAOYSA-N
PubChem
CID 24870

Every name it appears under

43 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
  • 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

Values set by assessing bodies. A body that has not set a value is not listed here.
TypeValuePopulationAssessed byOpinion
TDI0.03 mg/kg bw/dayconsumersEFSA AFC2006

Evidence and how bodies read it

Studies, and the differing conclusions regulators drew from them, are curated by hand rather than machine-read, and none has been written for this substance yet.

Sources for this page

  • ecfr retrieved 2026-09-07

Full licence terms and publisher details on Sources. How this page is built and updated: Method.

Machine-readable:/api/v1/additives/chlorine-dioxide.json