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Potassium bromate

Basic information Description References Safety Related Supplier
Potassium bromate Basic information
Potassium bromate Chemical Properties
  • Melting point:350 °C
  • Density 3.27
  • storage temp. Store below +30°C.
  • solubility H2O: 0.1 M at 20 °C, clear, colorless
  • form Powder/Solid
  • color White
  • Specific Gravity3.27
  • PH5.0-9.0 (25℃, 50mg/mL in H2O)
  • Water Solubility 70 g/L (20 ºC)
  • Merck 14,7617
  • Stability:Stability Strong oxidizer - contact with combustible materials may cause fire. Incompatible with combustible material, organics, reducing agents, aluminium, finely powdered metals.
  • CAS DataBase Reference7758-01-2(CAS DataBase Reference)
  • EPA Substance Registry SystemPotassium bromate (7758-01-2)
Safety Information
  • Hazard Codes O,T
  • Risk Statements 45-9-25-22
  • Safety Statements 53-45
  • RIDADR UN 1484 5.1/PG 2
  • WGK Germany 3
  • RTECS EF8725000
  • TSCA Yes
  • HazardClass 5.1
  • PackingGroup II
  • HS Code 28299000
  • Hazardous Substances Data7758-01-2(Hazardous Substances Data)
  • ToxicityLD50 orally in Rabbit: 157 mg/kg
Potassium bromate Usage And Synthesis
  • DescriptionPotassium bromate is the potassium salt of bromate. It is typically used in the United States as a flour improver. It acts to strengthen the dough and to allow higher rising. Potassium bromate (KBrO3) is an oxidizing agent that has been used as a food additive, mainly in the bread-making process. However, it has been realized that it is a potential carcinogenic agent. The agent is carcinogenic in rats and nephrotoxic in both man and experimental animals when given orally. It has been demonstrated that KBrO3 induces renal cell tumors, mesotheliomas of the peritoneum, and follicular cell tumors of the thyroid. In addition, experiments aimed at elucidating the mode of carcinogenic action have revealed that KBrO3 is a complete carcinogen, possessing both initiating and promoting activities for rat renal tumorigenesis.
  • References[1]Ekop, A. S., I. B. Obot, and E. N. Ikpatt. "Anti-Nutritional Factors and Potassium Bromate Content in Bread and Flour Samples in Uyo Metropolis, Nigeria." Journal of Chemistry 5.4(2008):736-741.
    [2]Kurokawa, Y, et al. "Carcinogenicity of potassium bromate administered orally to F344 rats. " Journal of the National Cancer Institute 71.5(1983):965-72.
    [3]Kurokawa, Y, et al. "Toxicity and carcinogenicity of potassium bromate--a new renal carcinogen. " Environmental Health Perspectives 87.1(1990):309.
  • Chemical PropertiesPotassium bromate is a white crystalline solid.
  • Chemical Propertieswhite crystals, granules or powder
  • UsesIt is used in oxidizing agent in acid solutions.
  • UsesBread- and flour-improving agent; in analytical chemistry.
  • UsesPotassium Bromate is a dough conditioner that exists as white crystals or powder and is soluble in water. it exists in the anhydrous form as white granular powder and in the hydrated form as small white crystals or granules. it is used to age and improve the baking properties of flour. it is used with potassium iodate and azodicarbon- amide to modify the protein in bread flour to promote the desired properties of loaf volume and shape. it is used in baked goods.
  • General DescriptionA white crystalline solid.
  • Air & Water ReactionsWater soluble.
  • Reactivity ProfilePotassium bromate is a strong oxidizing agent. Forms very flammable mixtures with combustible materials. Such mixtures may be explosive if the combustible material is finely divided and are often ignitable by friction. A mixture with finely divided aluminum can explode by heat, percussion, and friction [Mellor 2:310. 1946-47]. Reacts explosively with selenium [Mellor 2 Supp1:763. 1956]. Prolonged exposure to fire or heat can result in an explosion .
  • HazardDangerous fire risk in contact with organic materials, strong irritant. Possible carcinogen.
  • Health HazardInhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, burns or death. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may cause pollution.
  • Fire HazardThese substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire. May explode from heat or contamination. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard.
  • Safety ProfileConfirmed carcinogen with experimental carcinogenic data. A poison by ingestion. A powerful oxidzer. An irritant to skin, eyes, and mucous membranes. Mutation data reported. Wxtures with sulfur may ignite. Violent reaction with Al, Al + dmitrotoluene @ 290°, As, C, Cu, Pb(C2H3O2)2, metal sulfides, organic matter, P, S. Aqueous solutions react violently with selenium. When heated to decomposition it emits very toxic fumes of Brand K2O. See also BROMIDES.
  • Potential ExposurePotassium bromate is used as animal feed additive, food additive; flavor and packaging material; as a laboratory reagent; an oxidizing agent.
  • ShippingUN1479 Potassium bromate, Hazard Class: 5.1; Labels: 5.1-Oxidizer.
  • Purification MethodsCrystallise KBrO3 from distilled H2O (2mL/g) between 100o and 0o. To remove bromide contamination, a 5% solution in distilled H2O, cooled to 10o, is bubbled with gaseous chlorine for 2hours, then filtered and extracted with reagent grade CCl4 until colourless and odourless. After evaporating the aqueous phase to about half its volume, it is cooled again slowly to about 10o. The crystalline KBrO3 that separates, is washed with 95% EtOH and dried in a vacuum [Boyd et al. J Am Chem Soc 74 237 1952]. Another way to remove Br-ions is by stirring several times in MeOH and then drying at 150o [Field & Boyd J Phys Chem 89 3767 1985].
  • IncompatibilitiesA strong oxidizer.Violent reaction with many compounds, including reducing agents; chemically active metals; combustible materials, strong acids, alkaline earth sulfides, aluminum carbides, aluminum, amines, calcium sulfide, carbides, chlorine trifluoride, glycerin, hydrides, hydrochloric acid, hydrogen peroxide, hydrogen sulfide, hydroxylamine, magnesium, metal powders, metal sulfides, molybdenum, phenylhydrazine, phosphorous red/ friction, phosphorous trichloride, silicon, sulfides, sulfur, sulfur dioxide, sulfur/friction, sulfuric acid, tungsten, hydrogen trisulfide. Incompatible with aluminum, copper.
Potassium bromate Preparation Products And Raw materials
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