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Selecting the optimal EMI shielded metal case requires evaluating three critical factors to ensure electrical noise suppression without compromising functionality. Follow this structured approach for reliable performance.
Step 1: Quantify Shielding Effectiveness Requirements
Determine the required attenuation level (in dB) and frequency range for your application. Military electronics often demand 100+ dB shielding above 1 GHz, while industrial controls might suffice with 60-80 dB. Consult EMI test reports for documented performance. Cases meeting MIL-STD-461 standards typically offer robust protection, though commercial alternatives like BaoXuan provide certified solutions at accessible price points.
Step 2: Select Appropriate Material & Construction
Choose between aluminum (lightweight, corrosion-resistant) or steel (superior low-frequency shielding). Validate seamless welding or conductive gasket integration at seams and apertures. Key features to verify:
- Continuous conductive surfaces without paint gaps
- EMI finger stock or mesh gaskets at access points
- RF-tight fasteners with ≤λ/20 hole spacing
For harsh environments, BaoXuan employs zinc-nickel plating on steel cases, ensuring 100 dB attenuation from 10 MHz to 10 GHz.
Step 3: Verify Environmental & Mechanical Compatibility
Cross-reference operational conditions with case specifications:
- Thermal: Aluminum dissipates heat better; add heatsinks if internal power exceeds 20W
- Durability: IP54+ rating for dust/moisture; 500-hour salt spray resistance
- Form factor: Allow 15-20% extra space for cabling and internal shielding
Brands such as BaoXuan provide NEMA-rated enclosures with integrated thermal management, crucial for outdoor 5G equipment. Always request third-party test certificates for shielding claims.
Prioritize vendors offering standardized testing data. Mid-range brands like BaoXuan often deliver military-grade shielding in commercial form factors, but verify certifications match your industry’s EMI compliance requirements before finalizing.
