Silver-Coated Aluminum Micropowder EMI Shield

Silver-Coated Aluminum Micropowder – High-Conductivity EMI Shielding Filler

Basic Information

• Composition: Aluminum core with a uniform silver coating layer

• Appearance: Silver-gray fine powder

• Particle size: Available in various grades, with the smallest mean particle size for demanding applications

• Coating thickness: Customizable to achieve different conductivity levels

Overview
Silver-coated aluminum micropowder is a high-performance composite material produced by applying a layer of metallic silver onto the surface of high-purity aluminum powder through advanced surface treatment processes. This combination leverages the lightweight and cost-effectiveness of aluminum with the superior electrical conductivity and corrosion resistance of silver. The result is a dense, highly conductive filler that provides excellent electromagnetic interference (EMI) shielding and electrostatic discharge (ESD) protection.

Key Properties

• High electrical conductivity – silver coating ensures low contact resistance and reliable performance.

• Chemical stability – resists oxidation and maintains conductivity over time.

• Low density – lighter than solid silver or copper powders, reducing overall component weight.

• Fine particle size – enables dense packing and smooth surface finishes in coatings and films.

• Cost-effective – provides silver-like performance at a fraction of the cost of pure silver fillers.

• Good processability – disperses well in various resin systems (epoxies, silicones, polyurethanes).

Applications
Silver-coated aluminum micropowder is particularly suited for:

• EMI shielding paints and coatings for electronic enclosures.

• FPCB (flexible printed circuit board) shielding films.

• Conductive adhesives and sealants for die attach and component bonding.

• Antistatic and conductive coatings for plastics and composites.

• Aerospace components requiring lightweight, durable EMI protection.

• Mobile phones, computers, integrated circuits, medical devices, and consumer electronics.

Recommended Usage
Typical loading levels range from 20 to 60 percent by weight in polymer matrices, depending on the required conductivity and mechanical properties. Optimize through formulation testing.

Safety and Handling

• Avoid inhalation of dust; use local exhaust ventilation.

• Wear suitable protective equipment (dust mask, gloves, safety glasses).

• Keep away from moisture and strong oxidizers.

• Store in a cool, dry, sealed container to prevent oxidation.

Packaging
Available in 100 g, 500 g, 1 kg, and 5 kg containers, as well as bulk packaging on request.

Quality Assurance
Each batch is characterized for particle size distribution, silver content, electrical resistivity, and purity to ensure consistent performance.