CUSTOM RFI SHIELDING SOLUTIONS

When radio frequency interference threatens device performance, precision-engineered shielding makes the difference between reliable operation and catastrophic failure. Deep Coat Industries designs and manufactures custom RFI shielding solutions that protect critical electronics across aerospace, medical, telecommunications, and military applications.

As an ISO-certified manufacturer with over 45 years of experience, we specialize in vacuum metallization coating technologies and RFI shielding of thermoformed plastics. Whether you need board-level shields, custom enclosures, or specialty coatings for harsh environments, our engineering team solves your most challenging interference problems.

What is RFI Shielding?

Radio frequency interference (RFI) occurs when unwanted electromagnetic signals in the radio frequency spectrum disrupt electronic device operation. While often used interchangeably with EMI, RFI specifically addresses interference from radio waves and wireless signals—typically ranging from 3 kHz to 300 GHz.

Why RFI Protection Matters

Inadequate RFI protection causes serious consequences across industries. Medical devices can malfunction during surgical procedures. Aerospace systems risk navigation errors or avionics failure. Industrial control systems experience erratic behavior, which may cause production shutdowns. Even consumer electronics suffer degraded signal quality and premature component failure when RFI goes unmitigated.

Regulatory agencies mandate strict shielding requirements. The FCC regulates commercial electronics, while MIL-STD-461 governs military applications and DO-160 addresses aerospace systems. Today’s modern society depends on the ability to control electromagnetic interference effects.

How RFI Shielding Works

Custom RFI shields create protective barriers that attenuate (or dampen) unwanted radio frequency energy that is entering or exiting electronic enclosures. Protection relies on three fundamental mechanisms: reflection, absorption, and containment, working in combination.

Reflection occurs when RF waves encounter conductive surfaces and bounce back toward their source. Highly conductive vacuum-metallized coatings excel at reflecting frequencies across broad spectrum ranges. Absorption happens when RF energy penetrates the shield material and converts to heat through eddy currents.

Shielding Design Principles

Effective containment addresses complete enclosure design including seams, material selection, and coating coverage. Shielding effectiveness depends on enclosure material, coating thickness, total volume, frequency type, and aperture characteristics. Our coating’s reflection, absorption, and grounded Faraday cage capabilities provide comprehensive protection—making precision engineering critical to performance.

Deep Coat Industries’ Vacuum Metallized RFI Shielding

Deep Coat Industries’ vacuum metallizing process provides advanced coating solutions for shielding enclosures and components from radio frequency interference. Our direct deposition services deliver continuous shielding layers that attenuate electromagnetic and radio waves coming into or out of devices.

We operate seven vacuum chambers for coating products—enabling flexible production capacity and rapid turnaround times. This advanced equipment accommodates single-layer coatings, multi-layer coatings of the same metal (to enhance shielding effectiveness), or multi-layer coatings with different metals (chosen for complex use cases), to meet all custom RFI shielding requirements.

Dual-Fire Coating Process

Our dual-fire method allows two layers of metal in a single vacuum draw and is used in four dedicated chambers. This engineered approach enables strategic material combinations optimizing both reflection and absorption characteristics across targeted frequency ranges. The process delivers uniform coverage on complex geometries, including thermoformed plastics and intricate component designs.

Quad-Fire Multi-Layer Technology

The quad-fire method accommodates combinations of up to four different metal layers in a single vacuum draw, and is used in three specialized chambers. Deep Coat Industries was founded on this patented process, which provides multiple shielding capabilities in one efficient vacuum operation. We can apply an array of common metals in the same batch, within boundaries set by galvanic corrosion, while avoiding oxidation between metal layers.

Seven Metal Coating Options

Deep Coat Industries offers seven different RFI shielding materials for coating applications, each selected for specific performance characteristics. Electrical conductivity impacts reflection effectiveness at higher frequencies. Magnetic permeability determines low-frequency absorption capability below 100 MHz. Our engineering team recommends optimal metal combinations based on your frequency ranges, environmental conditions, and performance requirements.

Material selection balances conductivity, permeability, corrosion resistance, weight, and cost. Our vacuum metallization capabilities enable metal coating on plastic substrates and thermoformed components for lightweight, cost-effective alternatives to solid metal construction while maintaining superior RF attenuation.

Copper RFI Shielding Coatings

Copper provides the highest electrical conductivity among common coating materials, delivering exceptional performance above 1 GHz. Vacuum-deposited copper films offer repeatable thickness control, which is critical for predictable shielding effectiveness across high-frequency applications. The material’s superior conductivity makes it ideal for telecommunications, data centers, and high-speed computing applications.

Aluminum Shielding Solutions

Aluminum balances good conductivity with low weight, making it preferred for aerospace applications where every gram matters. Its natural oxide layer provides inherent corrosion resistance without additional finishing. Aluminum coatings deliver reliable protection while minimizing overall system weight in weight-sensitive applications.

Nickel-Based Coatings

Nickel and nickel alloys combine excellent corrosion resistance with good magnetic permeability for low-frequency absorption. These coatings excel in harsh environments requiring long-term durability. Nickel-based materials provide reliable protection in marine, industrial, and outdoor applications that are exposed to moisture and temperature extremes.

Thermoformed Shielding Enclosures

Deep Coat Industries works with thermoformed plastics to craft single or double-sided custom RFI shields and enclosures. Our partners’ thermoforming equipment shapes plastic substrates into complex three-dimensional geometries before applying vacuum-metallized coatings. This integrated approach creates lightweight, cost-effective shielding solutions that may be impossible with traditional metal fabrication.

Thermoformed designs accommodate intricate contours, mounting features, and ventilation patterns while maintaining consistent wall thickness. We also maintain relationships with third-party thermoforming vendors for additional throughput on high-volume product lines, ensuring scalable production capacity.

Board-Level Shield Solutions

Board-level shields provide localized protection for individual ICs, oscillators, or circuit sections while minimizing weight and cost. Vacuum-metallized thermoformed shields attach directly to PCB ground pads, isolating sensitive circuits from interference. These component-scale solutions offer design flexibility impossible with stamped metal alternatives.

Custom Enclosure Designs

Full enclosure designs offer complete system-level protection when multiple components require shielding or external emissions must meet stringent regulatory limits. Our custom applications experience includes one-piece thermoformed enclosures, two-piece designs with removable sections, and complex cavity configurations that isolate different circuit sections.

Thermoformed enclosures integrate mounting bosses, snap features, and alignment posts directly into the plastic substrate before metallization. This eliminates secondary assembly operations while reducing overall system costs compared to machined metal alternatives.

Custom-Developed Masking

Deep Coat Industries is staffed with engineers trained in custom masking solutions to achieve perfect coverage for your product. Their work ensures your components get the metal coating exactly where needed while minimizing voids and over-coating. Precise masking controls which areas receive conductive coatings and which remain uncoated for electrical contacts, mounting surfaces, or cosmetic requirements.

Our development capabilities include in-house 3D printing for rapid prototype masking. We also maintain third-party relationships to ensure appropriate masking detail is applied across simple to highly complex product geometries. This custom-developed masking expertise enables selective coating of intricate features that may otherwise become very costly with standard masking techniques.

Surface Pre-Treatment Services

Proper surface preparation ensures optimal coating adhesion and long-term durability. Our pre-metallizing washing and surface treatment processes remove contaminants, oils, and release agents that could compromise coating quality. These cleaning protocols prepare plastic substrates for maximum metal-to-plastic bond strength, preventing delamination under thermal cycling or mechanical stress.

Decorative Over-Coating Options

Decorative over-coating provides environmental protection while maintaining electromagnetic properties. These finishing layers add chemical resistance, UV stability, and cosmetic appeal to metallized surfaces. Over-coatings can be transparent or pigmented, allowing visible metallic finishes or color-matched appearances while preserving underlying shielding effectiveness.

Aerospace RFI Applications

Avionics systems require shielding to perform across extreme temperatures and altitude-induced pressure changes. Our military experience helps us understand and advise on HNEMP protection for strategic defense systems where shielding effectiveness above 100 dB determines mission success. Lightweight vacuum-metallized thermoformed enclosures reduce aircraft weight while meeting DO-160 requirements—critical for fuel efficiency and payload capacity.

Medical Device Shielding

Life-critical medical devices demand absolute reliability. Shielding is required for implantable devices, MRI systems, patient monitors, and surgical robotics using biocompatible processes. Our solutions ensure ISO 13485 and FDA compliance while protecting sensitive electronics from interference that could compromise patient safety during procedures.

The overall goal for medical applications is protecting both equipment from external EMI and preventing devices from generating interference that would affect other sensitive instruments. MRI machine shielding, which requires some of the most aggressive attenuation, prevents generated EMI from destroying other electrical equipment in healthcare facilities.

Industrial & Agricultural Applications

Factory automation controllers and industrial IoT sensors for agricultural equipment withstand temperature extremes and mechanical vibration while maintaining reliable operation. Modern vehicles contain electronic control units vulnerable to interference from engine systems, requiring robust shielding solutions to prevent malfunction in safety-critical agricultural applications.

Data Center RFI Protection

High-density server environments create complex interference patterns that require sophisticated shielding approaches. Our cloud computing applications expertise addresses electromagnetic compatibility challenges in data centers where thousands of processors, power supplies, and high-speed interconnects operate in close proximity and generate significant RF emissions.

Hybrid Coating Technology

Hybrid shielding and coating integration sets Deep Coat Industries apart from conventional manufacturers. We combine vacuum-metallized layers with electromagnetic absorbing materials targeting specific frequency ranges. Multi-layer deposition, using our dual-fire and quad-fire processes, enables precise control over shielding effectiveness that is unattainable with single-material approaches of the same thickness.

This integrated capability proves particularly valuable in complex applications that require broadband protection across multiple frequency decades. Different metal layers address different portions of the RF spectrum, creating comprehensive shielding solutions optimized for your specific interference environment.

Engineering Support Services

Our experienced engineering team provides custom solutions for unique and highly specialized applications. We offer consultation services to evaluate your shielding requirements, recommend optimal coating configurations, and validate design approaches before full production commitment.

Engineering support includes material selection guidance, frequency-specific performance predictions, and application-specific testing protocols. Our team works directly with your engineers to solve complex electromagnetic compatibility challenges through innovative coating solutions.

US-Based Manufacturing

Deep Coat Industries’ US-based operations provide consistent availability and quality control. Our domestic manufacturing eliminates international shipping delays and trade uncertainties while providing direct access to engineering support throughout the product lifecycle. We serve customers across the United States as well as Europe and Asia, maintaining documentation and process controls meeting ISO 9001 and industry-specific quality standards.

Get Your Custom RFI Shield Quote

Deep Coat Industries delivers vacuum-metallized custom RFI shields engineered for your exact specifications. Our technical team provides design guidance, material selection support, and rapid prototyping to accelerate development timelines.

Submit your design files and performance requirements for consultation. We respond to inquiries promptly and work collaboratively to develop optimal shielding solutions. Contact us to speak directly with a shielding engineer about your RFI protection requirements and discover how our 45+ years of coating expertise delivers superior electromagnetic protection.