Protect parts from electromagnetic interference.
It is used to protect electrical signals from the outside world.

• Currently, construction methods for anti-EMI are electric plating, sputtering, spraying, electric paint, or the direct use of the shielding effect of metal materials, such as the use of stainless steel, aluminum, iron or aluminum-magnesium alloy, and other materials.
• The metal piece of masking is low cost and meets current environmental regulations. But the processing and assembly are complex and miscellaneous and are poor stability.
• Water electroplating, electric plating, conductive paint, and other environmental laws and regulations conflict or doubt, the establishment of the new plating plant is not easy in the future and will gradually be phased out and replaced.
• So far, workers using a vacuum sputtering process and the magnesium alloy should be the main way to effectively combat EMI.