Graphene Conductive Gasket for High-Voltage EMI Shielding

KLD-SM-0002 Conductive Gasket: Graphene-Enhanced High-Voltage EMI Shielding

In high-voltage environments such as EV onboard chargers (OBC), power modules, and industrial inverters, electromagnetic interference (EMI) coexists with strong electric fields and kilovolt-level potential differences. Conventional conductive gaskets often suffer dielectric breakdown under these conditions, leading to shielding failure and potential safety risks.

The KLD-SM-0002 conductive gasket addresses this limitation with a graphene-based composite conductive film integrated into a resilient polymer structure. It delivers both high shielding effectiveness and dielectric strength exceeding 6 kV/mm, making it a robust solution for next-generation high-voltage EMI shielding.

1. Structure Design: Balancing Conductivity and Insulation

KLD-SM-0002 adopts a three-layer composite architecture engineered for electrical and mechanical stability:

• Surface Layer: Graphene-modified conductive film
  Ensures a continuous, low-resistance conductive network
• Core Layer: Flame-retardant high-resilience PU elastomer
  Provides ≥95% compression recovery for long-term contact stability
• Interface Layer: Nano-scale bonding technology
  Eliminates delamination risk under thermal and mechanical stress

Key Performance Metrics (TDS):

• Dielectric Strength: >6 kV/mm
• Volume Resistivity: <10⁻³ Ω·cm
• Insulation Resistance (non-conductive side): >10⁶ Ω
• Compression Set: ≤8% (50% compression, 22h, 70°C)
• Flame Rating: UL94 HF-1

This conductive surface + insulating substrate design enables controlled current dissipation while preventing electrical breakdown—critical for high-voltage EMI shielding systems.

For a broader understanding of EMI shielding materials and design principles, see:
https://www.konlidainc.com/article/emi-interference.html

2. Engineering Comparison: Graphene vs Conventional Gaskets

Case Insight:
An EV OBC manufacturer experienced intermittent EMC test failures at 400V DC using standard gaskets. After switching to KLD-SM-0002, the system passed reliability validation with no degradation after 1000-hour aging tests.

For deeper failure mechanisms and mitigation strategies, refer to:
https://www.konlidainc.com/article/failure.html

3. Key Applications of Conductive Gaskets in High-Voltage Systems

The KLD-SM-0002 conductive gasket is optimized for demanding EMI environments:

• Electric Vehicles (EVs): OBC, DC-DC converters, BMS shielding
• Industrial Power Systems: Inverters, servo drives, photovoltaic systems
• Medical Equipment: High-voltage imaging systems (e.g., X-ray EMI suppression)
• 5G Infrastructure: Power modules requiring both EMC compliance and electrical safety

These applications require not only shielding effectiveness but also dielectric reliability, which conventional EMI gaskets often fail to deliver.

4. Why Graphene Conductive Gaskets?

Compared with traditional nickel-copper fabric gaskets, graphene conductive gaskets offer a superior material platform:

• High Electrical Conductivity: Excellent carrier mobility ensures low surface resistance
• Chemical Stability: Resistant to oxidation and corrosion in harsh environments
• Ultra-Thin and Flexible: Film thickness <10 μm reduces assembly constraints
• Wide Temperature Range: Stable from -55°C to +150°C

To understand how conductive materials evolve for EMI applications, see:
https://www.konlidainc.com/article/emishielding.html

5. Conclusion: Rethinking EMI Shielding for High-Voltage Design

As electronics move toward higher voltage, higher frequency, and higher integration, traditional EMI shielding materials are reaching their limits. The KLD-SM-0002 conductive gasket, powered by graphene composite technology, introduces a new standard:

• High dielectric strength
• Stable conductivity
• Long-term reliability

For engineers and procurement teams, selecting the right conductive gasket is no longer just about conductivity—it’s about system-level risk control in high-voltage environments.

Konlida supports:

• Standard KLD-SM-0002 conductive gasket supply (stock sizes available)
• Custom die-cut solutions (minimum width: 1.2 mm)