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Potassium Bromide
1. Basic Product Information
Product Name: Potassium Bromide
CAS Number: 7758-02-3
Molecular Formula: KBr
Molecular Weight: 119.00
Synonyms: Bromide salt of potassium, Kaliumbromid
Product Category: Basic inorganic chemical, analytical reagent, photographic chemical, pharmaceutical excipient, water treatment additive
2. Physical and Chemical Properties
Physical Indicators
- Appearance: White crystalline powder or colorless cubic crystal
- Odor: Odorless, slightly salty bitter taste
- Solubility: Freely soluble in water; soluble in glycerol; slightly soluble in ethanol; insoluble in acetone, ether and chloroform
- Melting Point: 734 °C
- Boiling Point: 1435 °C
- Density (20 °C): 2.75 g/cm3
- Hygroscopicity: Slightly hygroscopic under high humidity conditions
- Aqueous Stability: Neutral aqueous solution, stable at room temperature
Chemical Characteristics
- Molecular Structure: Ionic inorganic salt composed of potassium cation and bromide anion
- Core Chemical Reactivity: Can react with silver ions to form insoluble silver bromide precipitate; bromide ion can be oxidized to elemental bromine by strong oxidants
- Photostability: Stable under normal light; long-term strong UV irradiation slowly oxidizes bromide to Br?, turning solution yellow
- Thermal Stability: High thermal stability, no decomposition below melting point
- Chemical Compatibility: Compatible with neutral inorganic salts; incompatible with strong oxidants, concentrated sulfuric acid and heavy metal silver salts
3. Main Application Fields
- Core Application: Infrared Spectroscopy Analytical Reagent
Main raw material for IR sample tablet pressing; widely used in laboratory FTIR spectroscopy analysis - Photographic & Printing Chemicals
Raw material for silver bromide photosensitive emulsion in traditional photographic films, X-ray medical films - Pharmaceutical Industry Excipient & Raw Material
Raw material for sedative and antiepileptic veterinary preparations; used as bromide ion source in pharmaceutical synthesis - Oil & Drilling Additive, Water Treatment
Used as bromide biocide precursor for industrial circulating water disinfection; additive in oil well drilling fluid - Chemical Synthesis Raw Material
Source of bromide ion for organic bromination substitution reactions
4. Platform Category & Product Group Selection Guide
1) Domestic B2B Platform Category
Recommended Path: Basic Inorganic Chemicals / Bromides
Reason: It is a typical inorganic bromide salt, belongs to basic inorganic chemical category with high matching weight.
2) English Product Group Dropdown Options
Recommended Selection: Basic Inorganic Chemicals
Do not select Pharmaceutical Chemicals or Basic Organic Chemicals; it is inorganic salt raw material.
3. Standard Foreign Trade Packaging Specification
1kg sealed plastic bottle for lab reagent samples; 25kg woven bag lined with PE inner bag for industrial bulk orders; customized packaging available
5. Quality Specification Table
| Test Item | Standard Requirement |
| CAS Number | 7758-02-3 |
| Molecular Formula | KBr |
| Appearance | Uniform white crystal without yellow discoloration |
| Assay (KBr) | Reagent Grade ≥99.5%, Industrial Grade ≥99.0% |
| Water Content | ≤0.30% |
| Chloride (Cl?) | ≤0.10% |
| Sulfate (SO?2?) | ≤0.01% |
| Heavy Metals (Pb) | ≤10 ppm |
| Standard Storage Package | Light-proof sealed plastic container, 25kg PE lined woven bag |
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