The core principle of conductive sponge is to form a composite material that can maintain the elasticity of the sponge and realize the conductive function by compounding conductive materials (such as metal plating or conductive cloth) on the surface or inside of the polymer sponge matrix. Specific implementation methods include:
Structural composition
Matrix material: The sponge structure is formed by foaming polymer materials such as polyurethane or polyethylene, which has elasticity, corrosion resistance and shockproof properties.
Conductive layer: The surface is given conductivity by electroplating metal (such as nickel) or wrapping conductive cloth. Conductive cloth is usually made of fiber cloth electroplated with metal to ensure current conduction.
Conductive mechanism
The metal plating or conductive cloth forms a continuous conductive network, so that the current can be "all-round" conductive through the surface and inside of the sponge.
Some processes add conductive fillers (such as carbon fiber or metal particles) during the foaming stage to further reduce the resistivity of the material.
Function extension
Combined with conductive glue or back glue design, it improves the bonding performance with other electronic components.
The outer nickel plating can enhance the anti-corrosion performance and extend the service life.