Semiconductor/EMI Markets

Semiconductor CNC Machining & 90dB EMI Shield | Big Stone

Big Stone - Semiconductor CNC & EMI

How to Achieve 90dB+ EMI Shielding for Semiconductor Equipment Through Custom Multi-Layer CNC Components?

Big Stone Machinery Co., Ltd. provides fully customized 1 to 3-layer EMI shielding solutions engineered alongside precision CNC machining for semiconductor vacuum and cleanroom environments. Wire mesh ranges from 20 to 400 mesh across copper, brass, and stainless steel, with carrier substrates from 0.3 mm ultra-thin PET to 7 mm optical glass—achieving certified attenuation over 90dB.

Big Stone Machinery Co., Ltd. (Taiwan Headquarters) delivers high-reliability manufacturing solutions for the semiconductor industry. We integrate multi-axis CNC machining, micro-tolerance EDM, and advanced multi-layer composite EMI shielding with 1 to 3-layer wire cloth configurations, satisfying stringent high-frequency interference protection standards in front-end lithography, vacuum chambers, and packaging test equipment.

What Precision CNC Machining Capabilities Do We Provide for Semiconductor Fab Equipment?

1. CNC Precision Parts Machining (Stainless Steel & Aircraft Aluminum)
Specializing in SUS304 / SUS316L stainless steel and 6061 / 7075 aluminum alloys. We manufacture high- stability precision components for critical high-vacuum chambers and corrosive chemical environments.

2. Advanced Wire EDM & Precision Tooling Development
For ultra-hard alloys and intricate micro-geometries beyond standard rotary cutting, our EDM services deliver micron-level tolerances (±0.005 mm / ±0.0002 in.) for packaging dies and test fixtures.

3. Specialized Surface Finishing & Hard Anodizing
Including hard anodizing, precision bead blasting, and optical polishing. We enhance electrostatic discharge (ESD) protection and wear resistance to meet strict Class 10/100 cleanroom standards.

How to Customize Layers, Mesh Size, and Carrier Substrates for EMI Shielding?

Big Stone EMI shielding materials offer maximum engineering flexibility, achieving attenuation from 40dB to over 90dB:

  • Layer Count: Configurable in 1, 2, or 3-layer composite wire cloth. Multi-layer configurations deliver exponential attenuation against high-frequency RF.
  • Mesh Density: Broad selection from 20 mesh to 400 mesh.
  • Wire Alloys: Available in oxygen-free copper, brass, SUS stainless steel, or conductive nylon mesh.
  • Optical Glass Carriers: Standard 4.5 mm, with custom thicknesses from 3 mm to 7 mm (0.12 in. to 0.28 in. ).
  • PET Film Carriers: Standard 1.5 mm, with an ultra-thin 0.3 mm (0.012 in.) option for high flexibility and lightweight curved adhesion.
  • Modular Combination: Mesh counts, wire layers, and substrates can be freely customized to balance visual transparency and EMI attenuation.
Engineering Note: Due to the physical nature of fine wire weaving, micro-creases may appear under specific lighting angles; this is normal in composite lamination and does not impact the 90dB+ shielding effectiveness.
Custom EMI Shielding Parameters & Specifications
Custom Option Specification Range / Alloy Options Application Advantage
Mesh Layers 1, 2, or 3-Layer Composite Structure Maximizes dB attenuation up to 90dB+
Mesh Count 20 to 400 Mesh Balances visual transparency and RF frequency blocking
Wire Alloys Copper, Brass, SUS Stainless Steel, Nylon High electrical conductivity and vacuum chemical resistance
Optical Glass 3 mm to 7 mm (Standard 4.5 mm / 0.18 in.) High structural rigidity for chamber observation viewports
PET Film 0.3 mm to 1.5 mm (0.012 in. to 0.059 in.) Ultra-thin flexibility for internal shielding and curved housings
Big Stone Precision Semiconductor CNC Parts and Multi-Layer EMI Shielding Components
Semiconductor-grade CNC parts & multi-layer EMI shielding materials
Big Stone CNC Machining Center Front View - Semiconductor Fabrication Multi-Layer EMI Shielding Process - Custom Copper Wire Mesh
30 Mesh Copper EMI Shielding Glass 4.5mm - 1 to 3 Layers
30 Mesh Glass (4.5mm)
30 Mesh Copper EMI Shielding PET 1.5mm - Ultra-Thin Custom
30 Mesh PET (1.5mm)
100 Mesh Copper Shielding Glass 4.5mm - High Attenuation
100 Mesh Glass (4.5mm)
100 Mesh Copper PET Shielding Film - Custom Wire Layers
100 Mesh PET (1.5mm)
200 Mesh Copper EMI Glass - 4. 5mm High-Density Shielding
200 Mesh Glass (4.5mm)
200 Mesh Copper PET 1.5mm - 1 to 3 Layer EMI Customization
200 Mesh PET (1.5mm)

📞 Request Custom EMI Specifications

Drawing evaluation and rapid prototype sample consultation

Email: info@bigstone.com.tw

Engineering: +886-3-5931688

How to Select the Optimal EMI Shielding Configuration for Semiconductor Equipment?

Follow these 4 engineering assessment steps to determine the optimal layer count, mesh size, and substrate carrier:

Step 1 – Define Attenuation Targets & Frequency Exposure:
Determine minimum shielding attenuation (e.g., 60dB or 90dB+) based on the high-frequency RF field intensity in your cleanroom environment.
Step 2 – Choose Metal Mesh Layer Count:
Standard protection can use 1-layer mesh; for high-power RF generators or microwave sources, select a 2 or 3-layer composite structure.
Step 3 – Select Mesh Density & Wire Alloys:
High mesh counts (100–400 mesh) block higher microwave frequencies. Choose copper for electrical conductivity, or SUS stainless steel for vacuum acid/alkali resistance.
Step 4 – Select Carrier Substrate & Thickness:
Use optical glass (3 mm–7 mm / 0.12–0.28 in.) for rigid observation viewports; use flexible PET film (0.3 mm–1.5 mm / 0.012–0.059 in.) for curved surfaces and lightweight internal shielding.

Frequently Asked Questions About Semiconductor EMI Shielding & CNC Machining

Q: What is the maximum EMI shielding effectiveness Big Stone can achieve?
A: Our 3-layer composite copper mesh solution achieves over 90dB of shielding attenuation, meeting the most demanding semiconductor fab and metrology equipment requirements.
Q: Can I customize the thickness and dimensions of shielding glass or PET carriers?
A: Yes. Optical shielding glass is available from 3 mm to 7 mm (standard 4.5 mm / 0.18 in.), and flexible PET film from 0.3 mm ultra-thin to 1.5 mm, precision cut to your mechanical drawings.
Q: What metal wire cloth alloys does Big Stone supply?
A: We supply oxygen-free copper, brass, SUS304/316L stainless steel, and conductive nylon mesh. Copper provides peak electrical conductivity, while stainless steel delivers outstanding corrosion resistance in cleanroom environments.
Q: Do micro-creases in the woven metal mesh affect shielding performance?
A: Not at all. Micro-creases are a natural physical occurrence in high-density fine wire weaving and composite bonding. Laboratory tests confirm that electrical continuity and 90dB+ shielding effectiveness remain 100% intact.
Q: What machining tolerances can Big Stone maintain for semiconductor parts?
A: Utilizing advanced multi-axis CNC milling, wire EDM, and CMM verification, we routinely hold micron-level tolerances (±0.005 mm / ±0.0002 in.) for high-vacuum chambers and cleanroom tooling.