EMC and insulation materials for military electronics
Which plastics are suitable for EMC-critical military electronics? Comparison of POM, PA6, PTFE and Pertinax with regard to insulation, moisture resistance and temperature stability.
Electronic systems in a military environment are subject to high demands: electromagnetic interference fields, strong temperature fluctuations, vibrations, moisture and mechanical loads. Plastics play a central role here, as they combine electrical insulation, moisture resistance and thermal stability.
The choice of the right material determines the function, reliability and service life of electronic assemblies.
Why EMC-compliant plastics are so important in defence technology
Unmanned systems, communication modules, radar components and tactical electronics require materials that minimise electrical interference while remaining mechanically stable. Plastics offer clear advantages here: they do not conduct, absorb only little moisture and retain their shape even under vibrations and changing temperatures.
Particularly in encapsulated modules, their material consistency is crucial for EMC safety and functional stability. When it comes to plastics for the military, rely on an experienced partner for engineering plastics.
Requirements for plastics in military electronics
Plastics must have a high dielectric strength, largely repel moisture and remain structurally stable even under load. Temperature changes lead to cracking or dimensional changes in less suitable materials.
Reliable EMC-compliant design therefore requires materials with defined insulation performance, controlled moisture absorption and stable thermal performance. You can find additional technical background in the guides on temperature resistance and mechanical load capacity.
Material comparison: POM, PA6, PTFE and Pertinax in an EMC context
POM-C – dimensionally stable, insulating and ideal for precise functional components
POM-C combines high dimensional stability, very good electrical insulation and low friction. It is particularly suitable for spacers, housing inserts, mechanical guide parts or precise insulation modules. Its low moisture absorption makes POM a reliable material for protected and semi-open electronic modules. More information: POM-C.
PA6 – robust construction material for functional insulating components
PA6 is tough, wear-resistant and mechanically loadable. It has good insulating properties, but absorbs more moisture than POM or PTFE. This makes it suitable for housing elements, functional electrical components and fastening elements, but less so for high-precision insulators. Details on the material: PA6.
PTFE – maximum insulation performance and highest moisture resistance
PTFE offers the best electrical insulation of the materials compared here. It is almost completely insensitive to moisture, extremely resistant to chemicals and retains its properties even under high temperature fluctuations. This makes PTFE ideal for high-frequency modules, HF spacers, insulating bearing surfaces or sealing modules. Material profile: PTFE.
Pertinax (FR2/FR3) – classic electronic insulating material
Pertinax (phenolic resin moulding compound, FR2/FR3) is a proven material in the field of PCB carriers, mounting plates and insulating bodies. It offers solid electrical insulation, moderate moisture absorption and good temperature resistance. Thanks to its dimensional stability, it is particularly suitable for carriers, bulkhead plates and mounting elements. More information: Pertinax.
Comparison table of insulation and EMC-relevant properties
| Property | POM-C | PA6 | PTFE | Pertinax |
|---|---|---|---|---|
| Electrical insulation | very good | good | excellent | very good |
| Moisture absorption | very low | increased | extremely low | medium |
| Temperature stability | good | medium | very high | good |
| Media resistance | good | good | extremely high | medium |
| Mechanical stability | high | high | low | good |
| Suitability for EMC-critical components | very good | good | excellent | good |
The table shows: while PTFE offers the strongest insulation and highest moisture resistance, POM-C convinces with a combination of insulating capability, dimensional stability and mechanical strength. PA6 is robust, but more moisture-sensitive. Pertinax forms a stable solution for classic electronic carriers.
Typical applications in military electronics
Plastics perform central functions in electrical and electromagnetically sensitive assemblies. These include sensor and communication modules, control units, radar and HF components as well as mechanical carriers and housings. POM and PA6 are often used for mounts, construction parts and functional housings. PTFE is found in HF insulators, sealing systems or insulated bearing surfaces. Pertinax serves as a carrier material for PCBs and mounting elements.
Manufacture of precise EMC and insulation components
Turned parts – precise insulators for military applications
For spacers, insulating bolts or functional modules, turned parts are often the best choice. They offer high dimensional accuracy, tight tolerances and reliable surface quality. You can find details on manufacturing under turned parts.
CNC machining – carrier plates, housings, modules
More complex structures such as housings, bulkhead plates or combined carrier bodies are frequently CNC-milled. Material behaviour, heat input and precision are explained in detail in the guide on CNC machining.
Which material for which EMC application?
For maximum electrical insulation and moisture resistance, PTFE is the first choice. POM-C combines high mechanical stability with very good insulation and is therefore ideal for load-bearing and functional components. PA6 is suitable for robust standard insulators, while Pertinax covers the established carrier solutions for PCBs and mounting elements. The selection depends on the specific area of application and the required EMC parameters.
FAQ
Which plastic offers the best electrical insulation? PTFE offers the highest insulation and is almost insensitive to moisture.
When is POM-C worthwhile? When high dimensional stability, low water absorption and precise machinability are required.
What is Pertinax suitable for in military technology? For carrier plates, mounting elements and insulating structural components.
Can PA6 be used for EMC-critical components? Yes, for robust insulating and housing components – however, POM or PTFE are superior when it comes to precision or moisture requirements.
Which manufacturing processes are typical for insulating materials? Turned parts and CNC machining, depending on the component geometry and the required precision.
