UL 94 V-0 Rated Solutions for Broadband EMI and Cavity Resonance Control
As electronic systems push into higher frequencies and tighter enclosures, unwanted electromagnetic radiation, internal cavity resonances, and cross-coupling become major threats to signal integrity and regulatory compliance.
Parker Chomerics CHO-MUTE™ 9005 and 9025, available from Matrix Technology Ltd, are elastomer-based microwave absorber materials engineered to attenuate RF energy across a broad frequency range while remaining flexible, manufacturable, and safe for use near active electronics.
Both materials are UL 94 V-0 flammability rated, making them suitable for close-coupled EMI mitigation inside electronic housings, modules, and RF cavities.
What Are CHO-MUTE™ 9005 and 9025 Microwave Absorbers?
CHO-MUTE 9005 and 9025 are silicone elastomer absorber sheets filled with ferrous material, designed to absorb RF energy and reduce reflections from metallic surfaces. Rather than reflecting EMI back into a system, these materials convert electromagnetic energy into heat, suppressing resonance and stabilizing system performance.
They provide broadband RF absorption from approximately 500 MHz to 18 GHz, making them effective across many modern wireless, defense, and high-speed electronic applications.
Key Material Characteristics:
- Broadband RF absorption from 500 MHz to 18 GHz
- Up to 20 dB RF absorption, depending on thickness
- Flexible silicone elastomer construction
- Sheet stock available with or without adhesive backing
- Easily die-cut for prototypes or production parts
- UL 94 V-0 flammability rated
- RoHS compliant
Need Help Selecting the Right Absorber?
Not sure which absorber thickness or material is right for your enclosure?
Matrix engineers can help evaluate CHO-MUTE™ 9005 vs. 9025 based on frequency range, cavity geometry, and installation constraints.
CHO-MUTE™ 9005 vs. CHO-MUTE™ 9025: Key Differences
While CHO-MUTE 9005 and 9025 share the same elastomer-based construction and EMI suppression intent, they differ slightly in thermal conductivity, allowing engineers to fine-tune performance tradeoffs.
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CHO-MUTE™ 9005
- Thermal conductivity: 0.56 W/m·K
- Optimized for EMI absorption where thermal dissipation is secondary
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CHO-MUTE™ 9025
- Thermal conductivity: 0.87 W/m·K
- Provides improved heat transfer while maintaining broadband RF absorption
This flexibility is especially valuable in compact electronics where both EMI control and thermal behavior must be balanced.
Designing for EMI and Thermal Performance?
Matrix helps engineers balance RF absorption, thermal behavior, and manufacturability—especially in compact, high-frequency electronics.
Safe for Use Near Active Electronics
Because both CHO-MUTE 9005 and 9025 are certified to the UL 94 V-0 flammability standard, they can be installed:
- Inside electronic enclosures
- Adjacent to PCBs, RF modules, and antennas
- Along enclosure walls and lids
- Near power electronics and signal paths
The flexible elastomer construction allows absorber sheets to conform to uneven surfaces and complex geometries, making them particularly effective at suppressing internal cavity resonances that traditional EMI shielding gaskets cannot resolve.
Typical Applications
CHO-MUTE™ microwave absorber materials are widely used in systems where high-frequency EMI and resonance must be controlled, including:
- Handheld electronics
- Wireless voice and data communication equipment
- Military and defense electronics
- GPS devices
- Ruggedized computers
- Night vision systems
- Telecommunications infrastructure equipment
These applications often involve RF energy trapped within metallic enclosures, where absorber materials provide a critical second layer of EMI mitigation.
Validating EMI Performance in a Prototype?
CHO-MUTE™ absorber materials can be precision die-cut for rapid testing and design iteration.
Available CHO-MUTE™ 9005 Product Configurations
Matrix Technology supplies CHO-MUTE™ 9005 in multiple thicknesses and interface options to support both evaluation and production programs.
Searching by Part Number or Thickness?
Matrix stocks multiple CHO-MUTE™ 9005 configurations and can convert them to your exact geometry.
| Product | Interface Type | Material Thickness (inch) |
|---|---|---|
| 46-70-1020-9005 | No Pressure Sensistive Adhesive (PSA) | 0.01 |
| 46-10-1020-9005 | No Pressure Sensistive Adhesive (PSA) | 0.02 |
| 46-20-1020-9005 | No Pressure Sensistive Adhesive (PSA) | 0.032 |
| 46-30-1020-9005 | No Pressure Sensistive Adhesive (PSA) | 0.062 |
| 46-40-1020-9005 | No Pressure Sensistive Adhesive (PSA) | 0.093 |
| 46-50-1020-9005 | No Pressure Sensistive Adhesive (PSA) | 0.125 |
| 46-11-1020-9005 | Electrically Conductive Adhesive Backing | 0.02 |
| 46-21-1020-9005 | Electrically Conductive Adhesive Backing | 0.032 |
| 46-31-1020-9005 | Electrically Conductive Adhesive Backing | 0.062 |
| 46-41-1020-9005 | Electrically Conductive Adhesive Backing | 0.093 |
| 46-51-1020-9005 | Electrically Conductive Adhesive Backing | 0.125 |
Simplify Installation and Assembly
Matrix offers precision die-cutting, adhesive application, and custom shapes to streamline installation and reduce assembly time.
Why Source CHO-MUTE™ Materials from Matrix Technology?
Matrix Technology Ltd is more than a distributor. We provide engineering support, precision converting, and compliance-ready supply for EMI materials used in high-reliability systems.
Precision Converting & Fabrication
- Rotary and flatbed die cutting
- Custom absorber shapes for enclosure walls and lids
- Laminating and PSA application
- Prototype through production-scale support
Engineering & Compliance Support
- EMI/EMC application guidance
- Thickness and placement recommendations
- Support for aerospace, defense, telecom, and industrial programs
Supply Chain & Value-Added Services
- Low-quantity access for R&D and testing
- Production kitting and sub-assembly
- Inventory programs for long product lifecycles
- Integrated support with XACT for materials + interconnect solutions
Matrix operates under AS9100 certification, NIST alignment, RoHS compliance, and the Controlled Goods Program.
Working in a Regulated or Mission-Critical Environment?
Matrix supports EMI materials with compliance-ready processes and documentation.
Looking to Reduce EMI, Resonance, or RF Interference?
Solving EMI problems usually requires more than a datasheet. If you're dealing with cavity resonance, cross-coupling, or high-frequency interference, Matrix can help engineer the right absorber solution—material, thickness, and form factor included.
Frequently asked questions
Common CHO-SEAL® conductive elastomer material families include:
- CHO-SEAL® 1285 – Silver-plated aluminum–filled elastomer
- CHO-SEAL® 1215 – Silver-plated copper–filled elastomer
- CHO-SEAL® 1217 – Silver-plated copper–filled elastomer optimized for mechanical compliance
- CHO-SEAL® 1298 – Nickel-graphite–filled elastomer
- CHO-SEAL® 1350 – Silver-plated copper–filled elastomer for high-performance EMI shielding
- CHO-SEAL® 6502 / 6503 – Environmentally focused conductive elastomers
These material families are available in molded sheets, molded parts, extrusions, and custom-fabricated configurations, depending on application requirements.
Exact part numbers vary based on form factor, dimensions, and finishing requirements. In many cases, these references identify the conductive filler system and elastomer base, with final part numbers defined by geometry, size, and fabrication method.
For application-specific part numbers or custom formats, Matrix Technology Ltd can assist with material selection, conversion, and cut-to-print options
A conductive elastomer gasket is a rubber-based sealing component filled with conductive particles. It provides both EMI shielding and environmental sealing by maintaining electrical continuity across enclosure seams.
They create a continuous conductive path between mating surfaces, reducing contact resistance and preventing electromagnetic energy from leaking through enclosure gaps.
Each solution has its place. Conductive elastomer gaskets are often selected when environmental sealing, corrosion resistance, and long-term stability are required in addition to EMI shielding.
Molded gaskets support complex geometries and tight tolerances, while extruded gaskets are typically more cost-effective for long or simple perimeter seals.
Yes. Matrix Technology Ltd. provides application guidance, material selection support, precision converting, and testing to help ensure conductive elastomer gaskets meet electrical, mechanical, and environmental requirements.
