1.What types of materials are suitable for shielding high-frequency electric fields?
Highly conductive material: Ordinary cold-rolled steel sheet. Primarily suffers from reflection loss. Utilizes the interaction between free electrons and electromagnetic waves to create a reverse electric field. Low cost, high rigidity, and shielding effectiveness up to 60dB@1GHz. However, it is prone to rust and requires surface treatment (such as galvanizing or spraying).
2.What types of materials are suitable for shielding low-frequency magnetic fields?
High permeability materials: Electromagnetic pure iron cold-rolled coils (such as DT4C, DT4E) and ultra-low carbon steel (requires patented processing). These materials primarily absorb losses. They require extremely high permeability (μ) to "absorb" magnetic lines of force within the material, thus protecting the internal space. Ordinary cold-rolled sheets (such as SPCC) provide very poor shielding in this frequency band.
3.If you are making enclosures/shields for 5G base stations, servers, or general electronic products, what are the requirements?
The primary purpose is to shield high-frequency electromagnetic waves generated internally or intruded externally from the equipment. Ordinary cold-rolled steel sheets (such as SPCC) are a very mature and cost-effective choice. They offer good strength, providing stable structural support, and their excellent conductivity effectively reflects high-frequency electromagnetic waves. It's important to note that rust prevention treatments such as galvanizing or spraying are typically required after forming.
4.If you are making internal magnetic shielding for relays, transformers, or precision instruments, what are the requirements?
At this point, the main issue is low-frequency magnetic field interference. Ordinary cold-rolled steel sheets (SPCC) are not suitable because their permeability is insufficient. You should choose electromagnetic pure iron cold-rolled coils with high permeability (such as the DT4 series). This material, also known as "electrical pure iron," undergoes special smelting and rolling processes to provide extremely low coercivity and ultra-high permeability, creating a "magnetic vacuum" environment for sensitive components.
5.If you are looking for the ultimate in thinness, flexibility, or special applications, what should you do?
Ultra-thin shielding layer: Patented technology is used to produce ultra-thin steel foil with a thickness of 20-100 micrometers (μm). Excellent magnetic properties are achieved through precise control of the cold rolling reduction rate (31%-90%) and annealing process; it can even be attached to components like a label.
Rust prevention/special environments: High-nickel cold-rolled stainless steel can be selected, or a special coating treatment can be applied to the surface of ordinary cold-rolled steel sheets.