What Materials Are Used for EMI Shielding

What Materials Are Used for EMI Shielding
EMI shielding is utilized in many industries, including in the military, agriculture, and medical fields. EMI stands for electromagnetic interference. EMI is often confused with electromagnetic compatibility, so make sure you know the differences between EMI and EMC. If you’re interested in learning what materials are used for EMI shielding, keep reading.

Copper Alloy 770

Copper alloy 770 is one of the many materials used for EMI shielding. Copper alloy 770, sometimes referred to as alloy 770, consists of three materials: 55% copper, 27% zinc, and 18% nickel. Copper alloy 770 is mainly used for its ability to resist corrosion. Another benefit is that it doesn’t require post plating to make it solderable or resistant to corrosion.

Steel

Another material that’s often used for EMI shielding is steel, which is more specifically referred to as pre-tin planted steel. Pre-tin plated steel is used because it’s a low-cost option. It’s also utilized because it offers corrosion protection, which prevents rusting. Steel also provides a solderable surface to attach the shield to the traces of the surface board.

Aluminum

Aluminum is also used in EMI shielding, but it does present some challenges. On a positive note, aluminum’s high conductivity and strength-to-weight ratio make it a good choice. Compared to copper, this material is less conductive. Aluminum is a non-ferrous metal, which means it doesn’t contain a significant amount of iron. Copper, tin, zinc, and brass are also non-ferrous metals. One of the benefits of using aluminum for EMI shielding is that it’s a cost-effective option. Another thing to note is that aluminum has poor solderability.

Copper

When discussing what materials are used for EMI shielding, copper must be mentioned. Copper is the most reliable metal used in EMI shielding. Copper is highly effective at reducing magnetic and electrical waves. It does cost more than other options, such as pre-tin-plated steel; however, it has a higher rate of conductivity. As you can see, there are many material options for EMI shielding. The most ideal option will depend on the budget and preferences of the industry.


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