Silver powder is the powder form of the silver element, with the chemical formula Ag and a molecular weight of 107.87. It belongs to the category of precious metal powders. Due to its excellent electrical conductivity and chemical stability, it is an indispensable basic material in the electronics industry. Depending on the particle size and morphology, it can be classified as spherical, sheet-like, or nano-sized silver powder. The color is typically grayish-white to yellowish-brown (the color may change at the nano level).

Basic parameters

Advantages and Characteristics

• Excellent electrical and thermal conductivity: Among all metals, silver has the highest electrical and thermal conductivity, making it the core material for electronic conduction.

• Chemical stability and sensitivity: Relatively stable in air, inert to water and oxygen, but extremely sensitive to sulfur and sulfides. It will change color (forming silver sulfide) when exposed to sulfur-containing air.

• Nanometer effect (for nano-silver powder): When the particle size reaches the nanometer level, the silver powder exhibits a strong surface effect, possessing excellent antibacterial and inhibitory properties as well as low melting point sintering characteristics.

• Processing adaptability: The ultrafine silver powder features spherical monodispersion and a narrow distribution. When formulated into a paste, it has good wetting properties and is suitable for printing and sintering for film formation.

Main purpose

Electronic industry

• Conductive pastes and inks: Used for manufacturing the electrodes of solar cells, the conductive lines of touch screens, RFID antennas, and membrane switches.

• Conductive adhesives and conductive coatings: Used for microelectronic packaging and electromagnetic shielding (EMI) coatings.

Antibacterial and Medical Applications

• Antibacterial agent: Nano silver powder has a strong inhibitory and killing effect on Escherichia coli, Staphylococcus aureus, etc. It is often added to medical devices, wound dressings, antibacterial textiles, and the inner coating of refrigerators, washing machines and other household appliances.

Catalysts and New Materials

• Catalysis field: In some chemical reactions, it functions as an efficient catalyst.

• Alloy manufacturing: Used for preparing precision alloys, silver solder materials and silver contact materials.

Packaging and Storage

Storage conditions: It should be stored in a sealed container in a dry, cool, and dark environment. Since silver powder is prone to reacting with sulfur and turning black, and nano-silver powder is prone to agglomeration, it needs to be stored in an airtight manner.

Packaging: Usually, it is sealed in plastic bags or glass bottles filled with inert gases (such as nitrogen) to prevent oxidation.