EMI SHIELDING COATING
Our EMI coatings shield electronics from interference.
Thin, lightweight, and frequency-tailored
What is EMI shielding used for?
Electromagnetic interference (EMI) shielding coating — including shielding against radio frequency interference (RFI) in the RF and microwave range — is used for blocking strong electromagnetic fields that would otherwise interfere with sensitive devices and signals. This interference may reduce performance or stop devices from working entirely.
Every generation of electronics packs more into less space, which raises the demands on EMI shielding, EMC performance and signal integrity. Our EMI shielding coatings are always optimised for your specific requirements and deliver high-performance EMC solutions for electronic enclosures and assemblies, in high-volume production.
Where an enclosure or assembly also needs protection from corrosion, this can be built into the same coating process. We design the layer stack so that the conductive shielding layer and a corrosion-resistant layer are produced in one PVD process. The result is a thin coating that adds negligible weight to the product.
Our thin film coating capabilities
- Conductive thin-film coatings with excellent electrical performance.
- Customised layer stacks adapted to substrate, environment, and performance targets.
- High-volume, industrialised production using proven PVD processes.
- Optimised for electronic enclosures and assemblies.
- Corrosion resistance integrated in the same layer stack.
- Approved supplier to the medical, mechatronic, defence, and aerospace industries.
Application to a wide range of materials including:
- Plastics
- Metals
- Silicon wafers
- Glass
- Ceramics
- Film substrates
EMI shielding coating options
We offer coating structures tailored to the specific requirements of each task, selecting the most suitable material combination based on substrate, environment, and shielding performance needs.
Examples of coating materials:
- Copper / Silver
- Chromium / Gold
Beyond copper/silver and chromium/gold coatings, we work with a range of advanced materials including aluminium, nickel, stainless steel, and titanium to meet specific application demands.
The choice of material we recommend is determined by substrate characteristics, environmental conditions, and shielding requirements. In corrosive environments, for example, stainless steel or titanium offer outstanding durability alongside effective shielding performance.
Typical Applications
Our EMI shielding coatings are well suited for plastic electronic housings, shielded enclosures for sensitive electronics, and EMC-critical assemblies across a broad range of industries.
EMI shielding performance
Our coatings deliver superior EMI shielding performance, excellent electrical conductivity, and outstanding adhesion to a variety of substrates. Results are consistent and reliable across production runs, and solutions are available for demanding and corrosive environments where standard coating materials may not be appropriate.
Electrical and functional thin-film expertise
Beyond EMI shielding, Polyteknik provides a broad portfolio of electrical and electronic functional thin-film coatings, including:
- Electrical contact layers (Al, Ag, Cu, Ni, ITO, Au)
- Adhesion and intermediate barrier layers
- Dielectric and corrosion-resistant coatings (e.g. oxides and nitrides)
- Magnetic layers (e.g. NiFe)
- Electrodes for piezo ceramics with precise patterning
This allows EMI shielding coatings to be integrated seamlessly with other functional layers in advanced electronic designs.
Antenna, waveguide, and RF component coating
Beyond enclosure shielding, our thin film coatings serve advanced antennas, radars, and waveguides, components where RF performance depends on precise, low-loss conductive surfaces.
- ESD coatings
- RF components on a range of substrates
- Copper coatings
- Protective top-layer coatings
- Controlled layer thickness for consistent RF performance
Why choose Polyteknik for EMI/RFI shielding coatings?
- Effective across both broadband EMI and RF-specific (RFI) interference
- Proven EMI and EMC performance
- Material and layer-stack optimisation for each application
- Extensive experience across regulated industries
- Industrialised, scalable production
- Support from concept and pilot to series production
Frequently asked questions
EMI (electromagnetic interference) is the problem: unwanted electromagnetic energy that disrupts the normal operation of electronic circuits. It can degrade signal integrity, cause data errors, or stop a device from functioning altogether.
EMC (electromagnetic compatibility) is the engineering goal: designing a product so it neither emits harmful interference nor is susceptible to it.
Achieving EMC compliance typically requires shielding, filtering, or a combination of both, and is mandatory for regulated markets such as medical, defence, and aerospace.
A thin, conductive metal layer – typically copper, silver, or a chromium/gold stack – is deposited directly onto the substrate surface using a magnetron sputtering PVD process. This creates a continuous conductive barrier that attenuates incoming and outgoing electromagnetic fields, reflecting or absorbing them before they reach sensitive electronics.
Because the coating is very thin, it adds negligible weight and allows complex geometries – including plastic enclosures – to be shielded without redesigning the part. The result is consistent, measurable shielding performance across high-volume production batches.
Yes, through a tailored layer stack that combines a conductive shielding layer with a corrosion-resistant layer, depending on substrate, environment and shielding requirements.
Shield your product from electromagnetic interference!
Contact us for a technical and dedicated discussion regarding your needs.
- Moellegade 21, 9750 Oestervraa
- Denmark
Copyright © 2026 Polyteknik AS All rights reserved