Description

Cesium CAS NO 7440-46-2 is a soft, silvery-gold alkali metal known for its exceptional reactivity and unique physical properties. Its primary commercial value lies in its high atomic weight and low ionization potential, making it a critical component in specialized industrial and research applications. This metal is essential for manufacturers in the electronics, energy, and chemical catalyst sectors, as well as for research institutions developing advanced technologies.

Application

• Photoelectric Cells & Night Vision Devices: Cesium is a key component in photocathodes due to its low work function, enabling efficient electron emission in low-light conditions.
• Atomic Clocks & Frequency Standards: The hyperfine transition frequency of the cesium-133 isotope defines the international standard second, making it fundamental for GPS, telecommunications, and scientific timing.
• Drilling Fluids for Oil & Gas: Formate salts of cesium are used in high-density, environmentally sensitive drilling muds for deep, high-pressure, high-temperature wells.
• Chemical Catalysis & Organic Synthesis: Acts as a powerful promoter or base in specialized organic reactions, including hydrogenation and polymerization processes.
• Medical & Research Isotopes: Cesium-137 is a γ-ray source for radiotherapy and industrial radiography, while stable isotopes are used in tracer studies.
• Magnetohydrodynamic (MHD) Power Generators: Used as a seed material to ionize gases and improve electrical conductivity in experimental power generation systems.
• Gettering in Vacuum Tubes: Purifies vacuum environments by reacting with and removing trace gases like oxygen and nitrogen.
• Specialty Glass & Optics: Incorporated to modify refractive index and density for lenses, scintillation crystals, and radiation shielding glass.

Basic Information

Item	Detail
Product Name	Cesium
CAS No.	7440-46-2
Molecular Formula	Cs
Molecular Weight	132.91 g/mol
Synonyms	Cesium Metal; Caesium; Caesium-133; Cesium-133; Cesium Element; Cesium Ingot; Cesium Wire; Cesium Ampoule; Cesium Sealed in Ampoule; Cesium under Argon; Cesium under Mineral Oil
EINECS	231-155-4

Quality Control

Our cesium metal is produced and handled under strict inert atmosphere conditions to prevent oxidation and ensure product integrity. We offer various purity grades, including high-purity (99.9%+) and reagent grades, with quality verified through instrumental analysis. Certificates of Analysis (COA) detailing assay, isotopic composition (for Cs-133), and trace metal impurities are provided with each shipment to ensure compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Cesium metal must be stored and handled under an inert atmosphere (argon or nitrogen) to prevent violent oxidation and potential ignition. Store in a cool, dry, well-ventilated area away from heat, sparks, open flames, and incompatible materials such as water, acids, and halogens. Recommended storage temperature is 15-25°C.

Specification

Item	Specification
Appearance	Silvery-gold metal, sealed under argon
Assay (Cesium, Cs)	≥ 99.5%
Isotopic Purity (Cs-133)	≥ 99.9%
Potassium (K)	≤ 0.1%
Sodium (Na)	≤ 0.05%
Rubidium (Rb)	≤ 0.05%
Iron (Fe)	≤ 50 ppm
Other Metallic Impurities	≤ 100 ppm (total)

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.