Engineering plastics in military technology

Engineering plastics play a central role in the modern military and defence industry. They offer high load-bearing capacity, temperature resistance, chemical resistance, electrical insulation and a very good weight-to-stability ratio.

This means they meet requirements where metallic materials reach their limits or cause unnecessary weight. For safety-critical systems, electronic assemblies, avionics, vehicle engineering and equipment, engineering plastics are now indispensable construction materials.

Why plastics are becoming increasingly important in military engineering

Military applications demand materials that function reliably even under extreme conditions. Engineering plastics offer clear advantages for this:

– low weight with high strength – no corrosion – high temperature and media resistance – excellent electrical insulation – good impact and vibration damping – precise machinability

A general overview of high-performance plastics such as PEEK is provided by the guide PEEK plastics.

Requirements for materials in defence engineering

Thermal requirements

Components must withstand high continuous and peak temperatures. Materials such as PEEK retain their strength even at around 250 °C and are suitable for drive and electronic systems. Details on temperature stability and material behaviour can be found on the PEEK material page.

Mechanical load-bearing capacity

Components are exposed to strong forces, impacts and vibrations. Plastics with high impact strength and strength remain reliable even under dynamic load. An in-depth introduction to mechanical properties and test methods is provided by the article Plastics hardness testing.

Chemical and media-related resistance

Contact with fuels, oils, lubricants and aggressive media is unavoidable in defence engineering. High-performance plastics such as PEEK and PTFE retain their properties even under such conditions. An overview of media resistance is provided by the guide Plastics & chemical resistance.

Dimensional accuracy under extreme conditions

Temperature changes, moisture and pressure must not affect component geometry. Engineering plastics require high dimensional stability as well as low water absorption. Basic terms on topics such as linear expansion and degree of crystallisation can be found in the Plastics lexicon.

Weathering & radiation resistance

UV radiation, moisture, salt water and radiation place additional stress on materials in many areas of application. For outdoor applications, the article Plastics for outdoor use supports material selection.

Important plastics for the defence industry

PEEK – high-performance plastic for extreme operating conditions

PEEK combines exceptional temperature resistance, chemical resistance and mechanical stability. The material is suitable for highly precise functional components, bearing and sliding components as well as electronic protection systems. Further information can be found on the PEEK material page and in the lexicon article on PEEK.

For comparison questions – for example, when PEEK or PTFE is appropriate – the technical article PEEK vs. PTFE offers additional decision-making support.

PTFE – extremely low-friction & chemical-resistant

PTFE offers excellent sliding and sealing properties. Typical applications are seals, valves, bearing bushes and insulators for electrical systems – wherever very low friction and high media resistance are required.

PA and POM – proven standard engineering materials

PA and POM are used for robust housings, guide parts and structural components. They offer a balanced ratio of strength, toughness and machinability and are therefore ideal all-round materials for many military applications.

PEI, PSU and PPSU – for electronics, optics and high-load assemblies

These materials are particularly suitable for electronic housings, optical systems, screw fittings and insulators in areas where high temperature stability and media resistance are required.

PC and ABS – structural components & housings

PC and ABS are widely used for covers, housings, encapsulations and visible components. They offer good impact strength, transparency (PC) and multiple design options.

Typical applications of engineering plastics in military engineering

Vehicle and weapons engineering

– temperature-stable housings – functional and guide elements – sliding and bearing components (e.g. PEEK or PTFE bushes) – heat-resistant components in the engine and exhaust system

Aviation & avionics

– lightweight structural components – components with EMC function – insulating elements and mounts in cockpit, avionics and on-board electronics

Electronics protection

– housings and covers – carrier plates and insulators – vibration- and shock-damping components in sensitive measurement and communication systems

Seals & guides

– PTFE elements in hydraulic and pneumatic systems – plain bearings and bushes made of PEEK for high-load and high-temperature areas

Special applications

– chemical-resistant components in fuel and hydraulic systems – components with high dimensional stability in precision mechanics and optics – function-integrated plastic components with combined structural, electrical and media-resistant function

Advantages over metallic materials

– significantly lower weight – no corrosion or oxidation – better electrical insulation – less maintenance – lower noise development – high design and functional freedom

In safety-critical areas, these advantages improve functional reliability, service life and performance. In-depth fundamentals on plastics compared with metals can be found in the article Plastic sheets – overview & possible applications.

Processing & manufacturing in the defence industry

Engineering plastics can be processed very precisely. Typical processes:

CNC milling

CNC milling enables the precise manufacture of complex geometries with tight tolerances. Further information can be found under Milled parts and in the guide CNC machining of plastics.

CNC turning

CNC turning produces highly accurate rotationally symmetrical components such as bushes, rollers or sealing bodies. Details on this under Turned parts.

Cut pieces & semi-finished products

Sheets, rods and cut pieces form the basis of many military components. An overview of available formats and materials can be found under Plastic semi-finished products, and the subsequent machining under Plastic machining.

These manufacturing processes enable tight tolerances, high surface quality and material-appropriate precision – especially with high-performance plastics such as PEEK.

Comparison of important plastics in military engineering

Material	Temperature resistance	Chemical resistance	Mechanical strength	Electrical insulation	Special features
PEEK	very high	very high	very high	high	universal high-performance plastic for safety-critical applications
PTFE	medium	very high	low	very high	extremely low coefficient of friction, ideal for seals & plain bearings
PA	medium	medium	good	medium	impact-resistant, cost-efficient for structural parts
POM	medium	medium	good	medium	very good machinability, precise functional components
PEI/PSU	high	good	good	high	ideal for electronics & optics, high temperature stability

Further content

– Material details: PEEK material page – Short definition & fundamentals: Lexicon article PEEK – Background & practical examples: Guide PEEK plastics – Comparison: PEEK vs. PTFE – Processing & CNC manufacturing: Plastic machining, Milled parts, Turned parts, CNC machining – Industry focus defence: Defence industry

FAQ

Why are plastics used in a military environment? Because of their high load-bearing capacity, their low weight, their media resistance and the possibility of integrating functions such as insulation or damping directly into the component.

Which plastic is considered particularly high-performance? PEEK – due to its temperature resistance, strength, media resistance and dimensional stability. An overview is provided by the PEEK material page.

Are engineering plastics reliable enough for safety-critical applications? Yes, with the right material selection, clean design and professional processing, they meet the highest requirements. Test and property values are explained, among other things, in articles such as Plastics hardness testing.

How do I select the right plastic for military applications? Selection is based on temperature, media, mechanical loads, electrical requirements and the manufacturing route. Guides such as Plastics & chemical resistance and CNC machining support the decision-making process.

Engineering plastics for military systems

Engineering plastics are indispensable for modern military systems. They combine strength, temperature resistance, chemical resistance and low weight – central requirements of the defence industry. In combination with precise manufacturing and specialised high-performance plastics such as PEEK, this creates a reliable basis for functionally critical applications in vehicle engineering, aviation, electronics, special equipment and defence systems.