EMI Shielding: The Power of Protection


Many industries like defense, aerospace, agriculture, automotive, healthcare, transportation and rail sectors heavily rely on cutting-edge electronic equipment. 

Electromagnetic Interference, or EMI, can wreak havoc on sensitive electronic equipment, leading to malfunctions, data corruption, and even catastrophic failures. To safeguard these industries, EMI shielding plays a pivotal role. 

Introduction: Electromagnetic Interference  

Electromagnetic Interference, otherwise known as EMI, is the disturbance caused by electromagnetic radiation from one electronic device affecting the performance of another nearby device. It can have a significant impact – from items we use daily to major electronic infrastructures. 

In this blog post, the importance of EMI shielding will be explored in the context of sectors that view quality assurances, high standards for certification, and regulatory compliance as non-negotiable. 

They continually push the boundaries of innovation, demanding ever more efficient and sensitive devices. This is where EMI shielding comes in. 

Understanding EMI Shielding

EMI, in its simplest form, refers to the disturbance that affects the performance of electronic devices due to electromagnetic radiation or conduction. This interference can be generated from various sources, including power lines, electronic devices, radiofrequency transmissions, and many more. The consequences can be substantial.

EMI and Leading Industries

Communications Systems

In the telecommunications sector, seamless communication is imperative. EMI can degrade the performance of cell towers, base stations, and communication networks, leading to dropped calls, slower data speeds, poor network performance and reduced reliability. 

EMI shielding is essential to ensure constant and reliable connectivity.

Military, Defense

EMI can disrupt the operation of military and defense systems, including radar, communication, and navigation systems, posing significant security risks. To mitigate the impact of EMI on various electronic devices and systems, several measures are taken, such as shielding, filtering, proper grounding, alongside adherence to the appropriate standards. 

This shielding acts as a protective barrier, preventing electromagnetic interference from affecting sensitive electronic equipment. It involves the use of conductive materials, primarily metals, to absorb or reflect electromagnetic radiation, thereby creating a shield around the equipment. 

The aim is to ensure that electronic devices can operate in environments with minimal EMI and that they do not emit harmful interference to other nearby devices. 

Aviation, Aerospace 

Aerospace equipment, such as aircraft avionics and satellite systems, operates in extremely demanding conditions. In brief, EMI can jeopardize the integrity of communication systems, including control, radar and navigation, potentially resulting in incorrect readings and errors. This is a serious safety concern in the aviation industry.

Failure is not an option, making this type of shielding solution a lifeline for industries such as defense and aerospace. 

Agriculture, Automotive

Modern vehicles are packed with electronic components. EMI can disrupt these systems, impacting everything from engine performance to safety systems and features, infotainment, and more. This can result in vehicle malfunctions and safety hazards.

For the agricultural and automotive industries, this shielding is essential to ensure reliability and safety. 

Medical, Healthcare

EMI can pose a serious risk in healthcare situations. In medical settings, EMI can interfere with the operation of medical devices and equipment, potentially compromising patient safety and even putting lives at risk. For instance, the operation of pacemakers, defibrillators, and other medical equipment may be interfered with. 

EMI shielding is a critical component in ensuring the accuracy and reliability of medical instruments, from MRI machines to ventilators, and supporting the best possible outcomes. 

Electronics, Appliances

EMI can disrupt the functioning of devices like smartphones, tablets, laptops, and televisions. It may cause interference, screen flickering, audio distortion, or even complete device malfunction. It can affect the operation of household appliances, such as microwave ovens, Wi-Fi routers, and cordless phones, too, potentially leading to malfunction or reduced performance.

Transportation, Critical Infrastructure

In transportation, EMI can affect operations in regard to railways, traffic management systems, and other critical transportation infrastructure, leading to safety concerns and service disruptions.

It can disrupt manufacturing and industrial processes, too, affecting machinery, sensors, and control systems. This can lead to production downtime and quality issues. The operation of power generation, transmission, and distribution systems can also be impacted, potentially leading to blackouts or other power-related issues. 

This protective shield is essential in preserving the integrity of electronic devices in the aforementioned sectors and industries.

The Importance of Metal Coatings 

Conductive Coatings

Conductive coatings are typically composed of metals like copper, aluminum, or silver. They should be resistant to environmental factors like humidity, temperature fluctuations, and abrasion, ensuring long-lasting protection. 

These coatings are applied to the surface of electronic devices, forming a conductive layer that acts as a barrier against EMI. They are flexible and can be customized to fit various equipment shapes and sizes, making them highly versatile.

Metals are excellent conductors of electricity, making them effective at dissipating electromagnetic interference. Lightweight metal coatings can be crucial in sectors where weight reduction is a priority, such as aerospace and automotive. 

Such coatings are used in a wide range of applications, and are a versatile solution for mitigating EMI in various industries.

Price of Failure 

The failure to properly shield against EMI can have serious consequences. These include: 

Data Corruption and Loss: EMI can lead to data corruption in digital systems, causing the loss or alteration of critical information. In scenarios where data integrity is paramount, such as in medical devices or aerospace systems, a failure in this regard can be catastrophic.

Malfunction of Safety-Critical Systems: EMI interference can disrupt the operation of safety-critical systems, like those in automotive, aviation, or medical equipment. A failure to shield against EMI could lead to accidents, injuries, or even loss of life.

Unintended Emissions: Failure to shield electronic equipment can lead to unintentional emissions, causing interference with nearby devices and systems. This can result in equipment malfunctions or unwanted behavior.

Increased Product Development Costs: EMI-related issues discovered after a product’s release can be costly to address, potentially requiring costly product recalls or redesigns.

Regulatory Violations: These shielding standards and regulations exist in various industries. A failure to meet these standards can result in legal and financial consequences, as well as damage to a company’s reputation.

To mitigate the worst-case scenarios of EMI shielding failure, it’s essential to design and test shielding solutions thoroughly, follow industry standards and regulations, and regularly assess and maintain EMI protection for critical systems and devices.

Quality Certifications, Compliance

When it comes to EMI shielding, ensuring that the materials and methods used meet high standards is paramount. Many industries demand adherence to specific quality certifications, such as ISO 9001, which signifies a commitment to quality management.

Government agencies have established regulations to limit electromagnetic interference. Compliance with these regulations is mandatory, ensuring that electronic devices do not cause or fall victim to interference.

Ensuring that a services provider and the EMI solution present can meet all quality certifications and regulatory standards not only helps guarantee reliability, but also puts safety – especially in critical applications like healthcare and aerospace – first. 

The Future of EMI Shielding

Industry demands are pushing the boundaries of what is achievable in EMI protection. 

As technology continues to advance, emerging technologies such as 5G and autonomous vehicles and equipment will require even more advanced EMI shielding solutions to ensure optimal performance and safety.

Advanced Materials

Researchers are continually developing new materials for the most innovative shielding, including carbon nanotubes, graphene, and metamaterials. These materials offer the promise of superior shielding performance and reduced weight.


With the trend towards smaller and more compact electronic devices, various methods will need to adapt to accommodate these changes. Providers on the leading edge are already working with advanced coatings and processes necessary for designs to fit into increasingly confined spaces.


The Internet of Things (IoT) and Industry 4.0 are driving the integration of electronics into various industries. Shielding against EMI will play a pivotal role in ensuring the reliability and security of these interconnected systems.


EMI shielding is a crucial element in protecting electronic equipment across leading industries. That’s because electromagnetic interference can wreak havoc on sensitive devices, leading to malfunctions, data corruption, and even catastrophic failures. 

The use of metalized coatings is helping fortify equipment against EMI, ensuring seamless operation and safety. As industries continue to advance, EMI shielding will evolve to meet the demands of emerging technologies and the ever-increasing need for smaller, more efficient, and interconnected electronic devices.

Solutions providers with well-vetted processes, adherence to high standards for quality assurance and right certifications, are pushing the boundaries of what’s achievable to ensure the reliability of electronic equipment, and helping guarantee safety in critical applications. 

At Deep Coat Industries, over the past 40+ years, the research and development surrounding our EMI shielding and vacuum metalization processes have been proven effective. Our coatings have been applied to overcome numerous complexities – demonstrating innovation in overcoming challenges associated with difficult plastic shapes and issues with adhesion. 

In fact, through a lens of continuous improvement, Deep Coat has developed our capabilities and can apply many different combinations of metal to maximize the effectiveness of shielding on your products. Here, we specialize in solutions that are customized for an array of diverse applications – a robust, cost-efficient and innovative solution to meet your specific needs.