What is Beryllium Copper Fingers
Beryllium Copper EMI finger stock gaskets have superior mechanical spring characteristics and high electrical conductivity making them ideally suited to shielding application where frequent access is required such as shielded room doors. These are available in profiles to suit most EMI shielding applications including grounding. Many plating finishes are available to address galvanic compatibility concerns and enhance shielding performance.
Beryllium copper (BeCu) spring finger and contact gaskets are manufactured by punching or etching.thin BeCu strip which is pressed and formed into the required final shape and then heat treated to give it ‘memory’.
Due to their high conductivity, BeCu gaskets provide good EMI/RFI shielding together with low closure force properties and are available in a number of plated finishes and mounting styles. In certain closingapplications the ‘wiping’ action enhances shielding performance.
The end product results in a low resistance contact finger with excellent anti-corrosion properties that remains flexible within acceptable limits for many years.
Beryllium Copper Fingers installation options
Clip-on Mounting
Clip-on Mounting provides a reliable mechanical installation when there is an accessible mounting flange. Various flange thicknesses can be accommodated, and lances can be incorporated to enhance the holding force to the flange.
Certain Clip-on strips have lance locations other than shown above. These dimensions are specified on the product drawings.
Stick-on Mounting
Pressure Sensitive Mounting provides double-sided pressure sensitive transfer tape for a fast, reliable installation. 3M F9469PC transfer tape or equivalent may be used at ambient temperatures from -67°F to 300°F. Apply only on a clean, oil-free surface, and allow a 24-hour cure time. Consult the factory for other adhesives and extended liner options.
Hook and stick fingers are ideal for flange mounting applications requiring low compression forces and small gap shielding.
Snap-on Mounting
Snap-on Slot and Edge Mount Symmetrical fingers using single or double fingers are very economical for applications such as sliding drawers, doors, rack-mounted assemblies and covers. They perform well in bi-directional applications and the snap-on capability makes them easy to install.
When continuous shielding is required the V Series or VE Series utilizing the same snap on mounting feature can be used. Available repeating finger patterns for the V and VE Series are shown here.
Extrusion Mounting
Special Mounting shielding strips can be installed by spot welding or soldering. Rivets can be used for the 375A and 500A profiles and conductive pressure sensitive adhesives are available.
Beryllium Copper Fingers Advantages
- In-house electroplating in a variety of finishes:
- Bright: no plating
- Nickel: dull, bright, or electroless
- Zinc: no chromate, clear chromate, or yellow chromate
- Tin: bright or matte
- Gold: hard
- Silver: semi-bright
- >100 standard configurations
- Gaskets are available in standard strip lengths or 25' coils
- Mounting methods: adhesive tape, clip-on, slot-mount, riveted, or soldered
- Mega soft reduces compression forces and increases the life cycle
Applications of Beryllium Copper Fingers
Beryllium Copper Fingers are suited for use in high cycling RFI/EMI and EMP applications where frequent access is required as their construction makes them resistant to fatigue and only low compression forces are needed. They are suited to high and low temperature applications and their wiping action makes them ideal for use in:
- Cabinet doors
- Access panels
- Personnel doors in screened rooms and containers
- Shielded rooms
- Grounding contacts
Specifications/Data
| Conductive aluminum foil | ||
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| Materials | Conductive Fabric+Conductive Adhesive+Release Paper | |
| Thickness | 0.5mm (Customizable) | |
| Surface Resistance | ≤0.05Ω/inch² | |
| Adhesion Strength | ≥0.7kg/inch | |
| Holding Time | >12H | |
| Vertical Resistance | ≤0.03Ω/sq inch | |
| Working Temperature | 10-80℃ | |
| Shielding Efficiency | 70-85dB (10MHZ-3GHZ) | |
| Conductive copper foil | ||
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| Materials | Copper/Nickel Foil+Conductive Adhesive+Release Paper | |
| Surface Resistance | ≤0.05Ω/inch² | |
| Tack | ≥1.5kgf/inch | |
| Shielding Efficiency | 70-85dB (10MHZ-3GHZ) | |
| Holding Time | >48H | |
| Thermal Conductivity | 380W/(m*k) | |
| Working Temperature | Short Time-20~120℃ Long Time-10~80℃ |
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