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Sodium Bromate (Industrial Grade) is a high-purity inorganic bromate salt, valued for its strong oxidizing properties, high bromine content (≈60%), and versatility in industrial processes. Unlike technical-grade sodium bromate, the industrial grade meets strict purity standards (≥99.5%) with minimal impurities (chloride <0.2%, sulfate <0.05%, heavy metals <5 ppm), making it suitable for flame retardant synthesis, chemical oxidation, and metal finishing. It is available as a white crystalline solid or aqueous solution (30–50% concentration), ensuring flexible handling for different applications. With a decomposition temperature >381℃ (melting point) and compliance with industrial safety standards (GB/T 1613-2022, ASTM E649), it serves as a critical oxidizing agent in brominated flame retardant synthesis (e.g., brominating aromatic compounds) and a key additive in metal etching. Its low toxicity (when handled properly) and cost-effectiveness further expand its use in water treatment and textile dyeing.
Industrial-grade Sodium Bromate has a purity of ≥99.5% (by titration), with strict impurity controls: chloride <0.2%, sulfate <0.05%, and heavy metals (Pb, Cd, Hg) <5 ppm. This high purity ensures consistent oxidizing performance in flame retardant synthesis—preventing catalyst poisoning or product discoloration. For example, when used to brominate diphenyl ethane (synthesis of decabromodiphenyl ethane), it achieves a bromination yield of >98% (vs. 92% for technical-grade), reducing raw material waste. Low heavy metal content also makes it suitable for pharmaceutical intermediate synthesis (e.g., brominating organic molecules for drugs).
As a powerful oxidizing agent (oxidation state of Br: +5), Sodium Bromate readily donates oxygen in acidic conditions—converting to bromide ions (Br⁻) or bromine (Br₂). This property is critical for brominated flame retardant synthesis: it oxidizes bromide ions (from sodium bromide) to elemental bromine, which then reacts with organic compounds (e.g., diphenyl ethane, phthalimide) to form brominated flame retardants. In metal etching, it oxidizes metal surfaces (e.g., copper, aluminum) to form soluble metal bromates, enabling precise circuit board etching. Its oxidizing strength is controllable via pH adjustment (stronger in acidic conditions), making it versatile for different processes.
Sodium Bromate is thermally stable, with a melting point of 381℃ and decomposition only above 400℃ (producing sodium bromide and oxygen). It absorbs minimal moisture (<0.3% at 23℃/60% RH) and does not cake during storage—ensuring a long shelf life (2 years in sealed packaging). Unlike sodium perchlorate (a highly explosive oxidizer), it is non-explosive and stable under normal handling conditions (avoiding contact with strong reducing agents like sulfur, phosphorus). This stability reduces storage and transportation risks, making it suitable for large-scale industrial use.
Compared to other oxidizing agents (e.g., potassium bromate, sodium chlorate), Sodium Bromate offers a lower cost per unit oxidizing capacity—making it ideal for high-volume applications. Its versatility spans multiple industries: as an oxidizer in flame retardant synthesis, an etchant in PCB manufacturing, a disinfectant in water treatment, and a dye oxidizer in textile processing. This multi-industry applicability reduces inventory costs for manufacturers handling diverse products. For example, a chemical plant producing both flame retardants and textiles can use the same Sodium Bromate for two processes, simplifying supply chain management.
• CAS Number: 7789-38-0
• Molecular Formula: NaBrO₃
• Molecular Weight: 150.89 g/mol
• Bromine Content: ≈60% (by weight, theoretical maximum)
• Purity (Industrial Grade): ≥99.5% (by iodometric titration)
• Appearance: White crystalline solid (or 30–50% aqueous solution)
• Particle Size: D50≈100–200 μm (crystalline form)
• Density (Solid): ≈3.34 g/cm³ (20℃)
• Melting Point: 381℃ (decomposes above 400℃)
• Solubility: ≈130 g/100 mL in water (20℃); ≈240 g/100 mL in water (100℃)
• Moisture Content: <0.3% (23℃/60% RH, Karl Fischer)
• Impurity Limits: Chloride <0.2%, Sulfate <0.05%, Heavy Metals <5 ppm, Iron <2 ppm
• Industrial Standards: Meets GB/T 1613-2022 (China) and ASTM E649 (U.S.) for industrial bromates
• Safety: Classified as GHS Category 5 (low toxicity); avoid contact with strong reducing agents and organic materials
• Packaging: 25 kg polyethylene-lined paper bags (solid) or 200 L HDPE drums (aqueous solution)
Sodium Bromate is a key oxidizing agent in brominated flame retardant (BFR) synthesis, including decabromodiphenyl ethane, Tetrabromophthalic Anhydride, and Ethylenebistetrabromophthalimide. In BFR production, it reacts with sodium bromide in acidic conditions to generate elemental bromine (Br₂), which brominates organic precursors. For example, a 10,000-ton/year decabromodiphenyl ethane plant uses 4,200 tons of Sodium Bromate annually, achieving a bromination yield of >98% and consistent BFR bromine content (≈82%). Its high purity ensures no impurity-related discoloration of BFRs, maintaining product quality.
In PCB manufacturing, it is used as an etchant for copper circuit patterns and aluminum substrates. Copper etching solutions (Sodium Bromate + hydrobromic acid) etch copper at a rate of ≈5 μm/min (25℃)—enabling precise circuit line widths (≥50 μm). Unlike ferric chloride (a common etchant), it produces less toxic waste and etches copper without undercutting, improving PCB accuracy. Aluminum etching solutions (Sodium Bromate + sulfuric acid) are used for PCB heat sinks, achieving smooth surfaces (Ra <0.5 μm) and precise dimensions.
Sodium Bromate is used as a disinfectant in swimming pool water and industrial cooling towers. In swimming pools, it reacts with chlorine to form hypobromous acid (HOBr)—a more stable disinfectant than hypochlorous acid (HOCl), especially in high pH (7.5–8.5) water. It reduces chlorine odor and eye irritation, improving user comfort. In cooling towers, it controls algae and bacteria growth (e.g., Legionella) at a dosage of 0.5–1.0 ppm, preventing biofouling and improving heat exchange efficiency.
In textile industry, it is used as an oxidizer for vat dyes and reactive dyes. Vat dyes (e.g., indigo) require oxidation to fix onto cotton fibers—Sodium Bromate (0.5–2% on dye weight) ensures complete oxidation, improving color fastness (washing fastness ≥4 grade，per ISO 105-C06). Reactive dye printing uses it to oxidize excess dye, preventing color bleeding and ensuring sharp patterns. For denim dyeing, it reduces indigo reduction time by 20%, increasing production efficiency while maintaining color depth.
