Collection: EMI/RFI Shielding
Photo Etched EMI/RFI Shielding
In our increasingly connected world, electronic devices are packed tighter than ever before. With this density comes a significant challenge: Electromagnetic Interference (EMI) and Radio Frequency Interference (RFI). Without effective shielding, sensitive components can malfunction, data can be corrupted, and critical systems in the medical or aerospace sectors could fail.
To combat these "invisible" threats, engineers rely on high-performance EMI/RFI shielding cans and enclosures. While there are many ways to manufacture these shields, chemical photo etching stands out as the most precise and cost-effective method for modern electronics.
What is EMI/RFI Shielding?
EMI/RFI shielding acts as a "Faraday Cage" for electronic components. It is a conductive barrier that wraps around sensitive parts of a circuit board to:
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Block Outgoing Interference: Prevent the device from disrupting other nearby electronics.
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Protect Against Incoming Signals: Shield internal components from external radio waves and electromagnetic noise.
Why Photo Etching is the Superior Choice for Shielding
Manufacturing shielding cans through traditional metal stamping often involves high upfront costs and mechanical limitations. Photo etching offers a specialized alternative that addresses the unique needs of the electronics industry.
1. Intricate Venting Patterns
Shielding needs to block interference, but it often also needs to allow for heat dissipation. Photo etching allows for the creation of incredibly complex hole patterns and ventilation grids without any additional cost. These patterns are etched with absolute precision, ensuring optimal airflow while maintaining the integrity of the shield.
2. Integrated Fold Lines (Half-Etching)
One of the greatest advantages of photo etching for EMI/RFI shields is the ability to include half-etched fold lines. This process etches a groove halfway through the metal, allowing the flat shield to be easily and accurately folded into a 3D box shape. This eliminates the need for expensive forming tools and ensures the shield fits perfectly over the designated PCB components.
3. Absolute Flatness and Precision
For a shield to be effective, it must sit perfectly flush against the PCB or mounting surface. Traditional stamping can cause "oil-canning" or slight warping due to the pressure of the die. Photo etching is a stress-free process, resulting in parts that remain perfectly flat, ensuring a superior seal against interference.
4. Material Flexibility
Different frequencies require different materials. Photo etching is compatible with a wide range of conductive alloys used in shielding, including:
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Nickel Silver: Offers excellent solderability and corrosion resistance without the need for plating.
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Mu-Metal: Specialized for shielding low-frequency magnetic fields.
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Stainless Steel: Provides high structural strength for rugged environments.
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Tin-Plated Copper: Combines high conductivity with ease of assembly.
Prototype to Production: Speed and Scalability
In the fast-paced world of consumer electronics and industrial IoT, waiting weeks for a stamping tool is not an option. Photo etching utilizes digital tooling, meaning design changes can be made instantly. You can go from a CAD file to a high-precision prototype in just a few days.
Once the design is validated, the same process scales effortlessly to high-volume production, maintaining the exact same tolerances from the first piece to the millionth.
Partner with BlazeAsia for Superior Shielding
At BlazeAsia, we provide end-to-end support for your EMI/RFI shielding needs. Whether you require complex multi-cavity shields or simple board-level cans, our photo etching process delivers the precision your technology demands.
Chemical Etching vs. Conventional Processes
Discover why engineers choose photo chemical etching over CNC machining, laser
cutting, and stamping for intricate metal parts.
| Feature | BLAZE Chemical Etching | CNC Machining | Laser Cutting | Stamping |
|---|---|---|---|---|
| Precision | Ultra-fine features with no burrs | Limited by tool size | High, but heat affects edges | Dependent on tooling |
| Tooling Costs | Low (Digital "Soft" Tooling) | Expensive | None | High hard tooling costs |
| Mechanical Stress | No stress, no part deformation | Cutting force may cause stress | Heat can alter properties | High-impact process |
| Design Flexibility | Easy design changes (no hard tooling) | Requires reprogramming | Flexible | Hard to modify |
| Speed | Fast for prototypes & production | Slower for intricate designs | Fast for cutting | Tooling setup time required |
| Material Compatibility | Ideal for thin, brittle & delicate metals | Limited to machinable metals | Some materials burn/melt | Not best for thick metals |
Advanced Design Inclusions
BLAZE offers advanced profile controls and custom design integrations that go beyond standard through-etching.
Half-Etching
Ideal for fold lines (simplifying hand-forming), integrating logos, barcodes, text, and intricate surface patterns without piercing the material entirely.
Component Tagging
Keep parts retained in the sheet for surface coating or plating operations using custom tags (protruding or recessed half-metal thickness tags), or receive them supplied loose.
Micro Features
Standard minimum feature size down to 0.075mm (or 100% of material thickness, whichever is greater). Enables extraordinary complexity.
Material Tolerance & Specifications
Compatibility and Precision Standards
- • Materials 0.010mm – 0.250mm thick: ±0.025mm standard tolerance.
- • Materials above 0.250mm thick: ±10% of metal thickness.
| Metal Thickness (T) | Hole/Slot Size | Bar Size | Internal Radius | External Radius | Profile Tolerance | Etch Profile Cusp |
|---|---|---|---|---|---|---|
| 0.050mm | 0.100mm | 0.100mm | 0.050mm | 0.040mm | ±0.025mm | 10-20% x T |
| 0.100mm | 0.110mm | 0.110mm | 0.100mm | 0.080mm | ±0.025mm | 10-20% x T |
| 0.150mm | 0.170mm | 0.170mm | 0.150mm | 0.120mm | ±0.025mm | 10-20% x T |
| 0.200mm | 0.220mm | 0.220mm | 0.200mm | 0.160mm | ±0.025mm | 10-20% x T |
| 0.250mm | 0.275mm | 0.275mm | 0.250mm | 0.200mm | ±0.030mm | 10-20% x T |
| 0.500mm | 0.550mm | 0.550mm | 0.500mm | 0.400mm | ±0.055mm | 10-20% x T |
| 0.700mm | 0.770mm | 0.770mm | 0.700mm | 0.560mm | ±0.077mm | 10-20% x T |
| 1.000mm | 1.100mm | 1.100mm | 1.000mm | 0.800mm | ±0.110mm | 10-20% x T |
| 1.500mm | 1.650mm | 1.650mm | 1.500mm | 1.200mm | ±0.165mm | 10-20% x T |
| 2.000mm | 2.200mm | 2.200mm | 2.000mm | 1.600mm | ±0.220mm | 10-20% x T |
With photo etching, the smallest inside and outside corner radius achievable is directly proportional to the thickness of the selected metal being processed.
- • Outside corner radius: Minimum of 75% material thickness.
- • Inside corner radius: Minimum of 100% material thickness.
Suitable Materials & Sheet Sizes
| Metal Family | Thickness Range | Max Sheet Size |
|---|---|---|
| Steel & Stainless Steels | 0.005mm - 1.500mm | 600mm x 1500mm |
| Nickel & Nickel Alloys | 0.010mm - 1.500mm | 600mm x 1500mm |
| Copper & Copper Alloys | 0.010mm - 2.000mm | 600mm x 1500mm |
| Aluminium Alloys | 0.025mm - 2.500mm | 600mm x 1500mm |
| Titanium & Titanium Alloys | 0.010mm - 1.000mm | 300mm x 500mm |
Exotic Metals & Custom Supply
Beyond our standard metal families, BLAZE is fully equipped to etch special and exotic metals upon request. We are also happy to work with customer-supplied material to meet your exact project specifications.