EMF Building Shielding Materials

SAFE AND SOUND AND SIGNAL PROTECT ARE EXCLUSIVE SLT BRANDS

Highly Recommended Building Shielding Materials

Worried about outside radio frequencies coming into your home? Are you showing high levels of radio frequencies on your RF Meter?

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For the radio frequencies that are beyond your control, our Aluminum RF Shielding Foil can be put up as an effective barrier against exterior sources of radio frequency exposure.

The Aluminum RF Shielding Foil was designed to be put up during new construction and renovation under drywall, plaster, and stucco, as well as on rooftops under shingles and in attic and crawl spaces. If you are worried about the levels of radio frequencies in your neighbourhood, it is ideal to invest in a radio frequency meter before buying additional EMF blocking materials.

G-iron ArmoFlex is designed as an EMF blocker against AC Magnetic Fields produced by the flow of electrical current. These fields are commonly produced by Power Lines on the street and entering your house, household appliances, electrical wiring in household walls, circuit breaker panels in the home, transformers etc. Unlike other types of magnetic field shielding, G-iron is very flexible and does not lose its shielding properties when bent or molded to various shapes. As a result, this product is an excellent choice for many shielding applications. There are multiple configurations that can be used to enhance the shielding power if required.

When you are given the task of designing an electromagnetic interference (EMI) shielded enclosure for a circuit board, understanding the balance between cost and performance is essential. There are many key decision points to always be aware of during the design process such as: budget (part price and tooling costs), galvanic compatibility, conductivity, the applications environment and how it relates to concerns with corrosion, material thickness, enclosure geometry (especially the shield height and how it relates to formability), application frequencies, short vs long term production quantities that will affect how your manufacturing method will evolve over time, packaging, and assembly of the shield onto the mating circuit board. One of the most crucial and fundamental decisions to consider after shield geometry is what material the shielded enclosure will be constructed from.

The material choice will have a direct effect on project cost and application performance from an electromagnetic compatibility (EMC) point of view. Leader Tech Inc. offers a comprehensive selection of materials from pre-tin plated steel to high permeability metal to meet every designer’s needs. Our Applications Engineers are knowledgeable and ready to offer guidance to get you started in the right direction.

Popular Metals Used in RFI Shielding

The most common metals used by Leader Tech customers for RFI / EMI shielding are pre-tin plated steel in both bright and matte finishes and copper alloy 770, as known as nickel silver or German silver. Here is a quick look on how each one of them works:

Pre-Tin Plated Steel

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Pre-tin plated steel is an ideal low cost solution that works well from lower frequencies in the kHz range through frequencies into the lower GHz range. Carbon steel has a permeability value in the lower hundreds range which provides the low-frequency magnetic shielding property that is missing in alloy 770, copper, or aluminum. The tin plating offers corrosion protection for the steel to prevent rusting as well as providing a great solderable surface to attach the shield to the traces on the surface board during assembly.

Copper Alloy 770 / Nickel Silver

Copper alloy 770, more commonly known as alloy 770, is a copper, nickel, zinc alloy used in EMI shielding applications mainly for its corrosion resistant properties. The alloy’s unified numbering system designation is UNS C77000. The base material is inherently aesthetic and does not require post plating to make it corrosion resistant or solderable. The material works well as an EMI shield beginning in the mid kHz range up into the GHz. The permeability is 1 which lends itself to be ideal in MRI related applications where no magnetic materials are permitted.

Copper

Copper is the most reliable metal in EMI shielding because it is highly effective in attenuating magnetic and electrical waves. From hospital MRI facilities to basic computer equipment, use of copper in RFI shielding serves the purpose effectively. Due to the versatility of this metal it can be easily fabricated along with its alloys brass, phosphorous bronze, and beryllium copper. These metals typically cost more than the alternative shielding alloys of pre-tin plated steel or copper alloy 770 but, on the other hand, offer a higher conductivity. Phosphorous bronze and beryllium copper are more commonly used in contact applications for batteries or springs due to their elasticity.

Aluminum

Although aluminum does pose a few fabrication challenges, it is still an excellent choice for a number of applications mostly due to its non-ferrous properties, its strength-to-weight ratio, and its high conductivity. Aluminum has nearly 60 percent of conductivity when compared with copper, however, using this metal needs precise attention to its galvanic corrosion and oxidation properties. The material will form into an oxide over time and has poor solderability on its own.

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