Custom Die Cut EMI Gaskets & Conductive Materials
Specialty Silicone Products (SSP) compounds high-performance conductive elastomers and converts them into precision die cut EMI gaskets with low minimum order quantities (MOQs) and rapid turnarounds. As an ITAR-registered, Made in the USA manufacturer certified to ISO 9001:2015, we handle the entire production lifecycle for EMI gaskets under one roof—from raw chemical compounding and continuous sheet calendering to in-house steel-rule toolmaking and high-speed press converting.
Whether you require MIL-DTL-83528 QPL-certified military gaskets, commercial nickel-graphite seals, or specialized fluorosilicone die-cut components with pressure-sensitive adhesive (PSA) backings, SSP delivers tight-tolerance shielding tailored to your exact enclosure specifications.
Die Cut EMI Gasket Materials Specification Matrix
The performance of any die cut EMI gasket depends directly on the base polymer and conductive filler compound selected. SSP formulates and manufactures a broad family of die cut EMI gasket materials in continuous rolls and molded sheet stock (12″ x 12″ and 15″ x 20″), allowing converted parts to meet specific environmental, mechanical, and electrical requirements.
| Base | Filler | Form Factors | Notes | |
| Silicone | Silver-Aluminum (Ag/Al) | Rolls, Sheets, Cut Gaskets | MIL-DTL-83528 QPL Type B. Premium aerospace and defense shielding; high conductivity and elasticity. | |
| Silicone | Nickel-Graphite (Ni/C) | Rolls, Sheets, Cut Gaskets | Commercial Shielding. Exceptional galvanic corrosion resistance against mating aluminum enclosures. | |
| Fluorosilicone | Silver-Aluminum (Ag/Al) | Rolls, Sheets, Cut Gaskets | MIL-DTL-83528 QPL Type D. Extreme resistance to jet fuels, hydraulic fluids, and solvents. | |
| Fluorosilicone | Nickel-Graphite (Ni/C) | Rolls, Sheets, Cut Gaskets | Chemical Commercial Grade. Combines fuel resistance with cost-effective commercial shielding. | |
| Silicone | Silver-Copper (Ag/Cu) | Rolls, Sheets, Cut Gaskets | Maximum Conductivity. Critical waveguide applications, power electronics, and EMP protection. |
Material Formats & Converting Options
Gauge Thickness Range: Standard continuous roll and sheet stock gauges from 0.010″ to 0.250″ (custom thin membranes and heavy-gauge sheets available upon request).
Durometer Range: Formulated across soft-to-firm durometers (20 to 80 Shore A) to accommodate delicate, low closure-force enclosures or high-pressure military housings.
Environmental Resistance: Operating continuous temperature ranges from -55°C to +200°C (-67°F to +392°F) with low outgassing variants certified to ASTM E595 for space-grade applications.
In-House Converting & Tooling Capabilities
When high-volume manufacturing, tight dimensional repeatability, and uniform cross-sections are required, die cutting offers the most efficient and scalable converting path. SSP converts raw conductive sheet stock and continuous rolls into finished gaskets using advanced press equipment and proprietary tooling techniques.
Steel-Rule Die Tooling & Precision Tolerances
We machine all cutting steel-rule dies in-house. This internal toolmaking capability eliminates long lead times associated with third-party tool shops, allowing us to move from CAD approval to physical prototype production in days rather than weeks. Our high-speed converting presses hold tight dimensional tolerances down to $\pm0.005″$, ensuring flawless bolt-hole registration and consistent wall thicknesses on complex connector gaskets, flange seals, and frame-style geometries.
Kiss-Cutting & Roll-Fed Automated Assembly
For high-volume manufacturing environments, hand-applying individual loose gaskets can create assembly bottlenecks. SSP offers kiss-cut die cut EMI gaskets supplied on continuous liner rolls with convenient pull tabs. Kiss-cutting cuts through the conductive elastomer and adhesive layer while leaving the backing release liner intact, enabling rapid peel-and-stick application or automated pick-and-place integration.
Pressure-Sensitive Adhesive (PSA) Lamination
To simplify gasket positioning during enclosure assembly, SSP laminates conductive materials with two distinct pressure-sensitive adhesive options:
Non-Conductive PSA: Typically applied as a narrow tape strip along the center or outer perimeter of the gasket frame. This leaves bare, exposed conductive silicone along the inner contact zones to maintain direct metal-to-metal contact with the enclosure flange.
Electrically Conductive PSA: Features an adhesive matrix embedded with conductive particles. Conductive PSA allows full-width adhesive coverage across the entire gasket surface while maintaining electrical continuity along the z-axis.
Die Cutting vs. Alternative Converting Methods
Selecting the correct manufacturing process depends on part geometry, production volume, and tooling budget. SSP offers multiple conversion pathways in-house to support your project at every stage of development.
When to Choose Die Cutting
High Production Volumes: Once steel-rule tooling is created, die cutting produces thousands of uniform gaskets rapidly with minimal cycle times.
Tight Part Geometries: Ideal for flat profiles with multiple internal cutouts, mounting bolt holes, and narrow wall sections.
Roll-Fed Automated Integration: Required when parts must be delivered kiss-cut on continuous release liners for rapid field deployment or automated assembly.
For short-run engineering trials, large picture-frame gaskets, or prototype runs without tooling investment, explore our zero-tooling flash cutting services. For 3D profiles, solid O-rings, or hollow D-strips, view our compression molded EMI gasket options.
Direct Drop-In Alternatives to Parker Chomerics CHO-SEAL®
SSP formulates direct material alternatives to Parker Chomerics CHO-SEAL®, Nolato Jabar, and other major conductive elastomer lines. By compounding our own materials in-house, we help defense contractors and industrial OEMs bypass long lead times and high minimum order requirements without compromising on shielding effectiveness, volume resistivity, or military specifications.
| SSP Material Designation | Parker Chomerics CHO-SEAL® Equivalent | Base Elastomer / Filler System | MIL-DTL-83528 Specification |
| SSP-2529 | CHO-SEAL 1285 / 1212 | Silicone / Silver-Aluminum | MIL-DTL-83528 Type B |
| SSP-2551 | CHO-SEAL 1298 / 1287 | Fluorosilicone / Silver-Aluminum | MIL-DTL-83528 Type D |
| SSP-502-V | CHO-SEAL 6370 / 6305 | Silicone / Nickel-Graphite | Commercial / Industrial |
| SSP-502-F | CHO-SEAL 6452 / 6502 | Fluorosilicone / Nickel-Graphite | Commercial / Chemical Resistant |
Frequently Asked Questions
What materials are best suited for die cut EMI gaskets?
Conductive silicone and fluorosilicone elastomers filled with silver-aluminum (Ag/Al), nickel-graphite (Ni/C), or silver-copper (Ag/Cu) particles are best suited for die cutting. These materials are compounded into continuous rolls or molded sheet stock, providing excellent physical integrity during high-speed stamping and punching.
Can die cut EMI gaskets be supplied with conductive pressure-sensitive adhesive (PSA)?
Yes. SSP supplies die-cut gaskets with either non-conductive PSA strips or full-coverage electrically conductive PSA. Conductive PSA incorporates conductive particles within the adhesive matrix to maintain electrical continuity across the z-axis between the gasket and the mating enclosure flange.
What is the difference between full-thru die cutting and kiss-cutting?
Full-thru die cutting cuts through both the conductive elastomer material and the backing release liner, producing individual, loose gaskets. Kiss-cutting cuts through the conductive material and adhesive layer but leaves the bottom backing liner intact, delivering finished gaskets on continuous rolls for fast peel-and-stick application.
How do I choose between silicone and fluorosilicone for a die-cut gasket?
Standard conductive silicone is ideal for general aerospace, defense, and industrial electronics requiring thermal stability (-55°C to +200°C) and environmental sealing against water and dust. Fluorosilicone is required when the gasket will be exposed to fuels, solvents, oils, hydraulic fluids, or aggressive chemical vapors, as it resists swell and degradation.