Introduction
When engineers talk about high-performance materials, the term "composite" almost reflexively comes up today. However, not every composite is the same – and the differences between thermosetting and thermoplastic matrix systems are far greater than many initially assume. This is particularly evident in one of the most demanding application fields: the military and defense sector.
A recent overview study in the journal Advances in Materials Science and Engineering (Birhan, 2026) shows that continuously fiber-reinforced thermoplastics (CFR TP) are taking on an increasingly strategic role in military applications – not because of a single advantage, but because of a unique property profile that no other material system can offer in this combination.
What makes the defense sector so revealing here: It demands the utmost. Extreme temperatures, impact loads, chemical exposure, weight restrictions – those who succeed there succeed everywhere. And that is exactly what makes the insights from this area so relevant for civilian high-performance applications in aviation, the automotive industry, and the energy sector.
Why thermoplastic composites are on the rise in the defense sector
The global market for composite materials in aerospace and defense is estimated to be around 25.4 billion USD by 2025 – with a projected growth to nearly 36 billion USD by 2030 (CAGR: 7.2%). Within this market, thermoplastic systems are systematically gaining market share over traditional thermosets.
The reason lies not in a trend, but in physics.
Thermoplastic high-performance matrices such as PEEK (Polyetheretherketone), PEKK (Polyetherketoneketone), or PPS (Polyphenylene sulfide) combine mechanical properties at the level of thermosets with characteristics that are structurally lacking in them: They melt, can be reshaped, and – crucially – can be reprocessed. The matrix system remains reversible. For military systems, this means: reparability in the field, shorter maintenance cycles, lower lifecycle costs.
In addition, there are the core mechanical advantages:
High impact toughness: Thermoplastic matrices absorb impact energy significantly better than cross-linked thermoset systems. Under ballistic loads – a central test criterion in the defense sector – this property is directly safety-relevant.
Excellent fatigue behavior: Under cyclic loading, as occurs in rotor systems, landing gear, or drive shafts, CFRP thermoplastics show superior fatigue resistance compared to metallic materials and many thermosets.
Chemical resistance: In particular, PEEK and PEKK resist aggressive fuels, hydraulic fluids, and solvents – substances that military platforms come into contact with daily.
Thermal stability: PEEK-based systems remain dimensionally stable up to over 250 °C. For engine proximity, exhaust areas, or high-speed applications, this is not an option, but a requirement.
The property profile that makes the difference
What particularly distinguishes thermoplastic composite materials in the defense context is the ability to meet multiple critical requirements simultaneously – without compromising one dimension at the expense of another.
Take the example of UAV structures (unmanned aerial vehicles): Here, weight, stiffness, impact resistance, and electromagnetic transparency are all required at the same time. CFRP thermoplastics with PEEK matrix provide a stiffness-to-weight ratio that surpasses aluminum alloys by a factor of 3–5 – while also offering significantly higher damage tolerance.
Or vehicle armoring: Thermoplastic composites enable lighter protective panels with comparable or superior energy absorption compared to steel components. This reduces the overall weight of armored vehicles – with a direct impact on mobility, range, and transportability.
Last but not least: the recyclability. Thermoplastic matrices can be melted and reprocessed through heat application. For military procurement agencies, which are increasingly under sustainability pressure, this is a growing procurement criterion – and a structural advantage over thermosetting systems, which can only be disposed of or mechanically shredded at the end of their life.
What this means for civilian high-performance applications
The defense sector often acts as a pioneer in the materials world: technologies that are validated there under extreme conditions find their way into the civilian industry – with shorter qualification efforts and reliable reference data.
This is exactly what can be observed with continuously fiber-reinforced thermoplastics. The properties that make them indispensable in the military sector are the same ones that are in demand in civilian aviation (structural components, pressure vessels, pipes), in the automotive sector (drive shafts, structural profiles), and in the energy sector (rotor sleeves, hydrogen tank overwraps).
The question is no longer whether thermoplastic composite materials are capable enough. The question is: Who can manufacture them reliably, reproducibly, and economically?
Conclusion: Material potential meets manufacturing reality
Thermoplastic composite materials are no longer a niche topic. Their property profile – high impact toughness, thermal stability, chemical resistance, recyclability, and superior specific values – makes them the logical choice for all applications where weight, lifespan, and reliability matter simultaneously.
The defense sector has recognized this. The civilian industry is following suit.
Whoever identifies the right manufacturing partners for CFR-TP components now secures a technological advantage that will continue to grow in importance in the coming years.
Learn how Alformet continuously manufactures fiber-reinforced thermoplastic pipes and profiles for high-performance applications – get in touch.
📚 SOURCES USED:
Birhan, Y. (2026). Integrating Composite Materials Throughout the Military Sector: A Review. Advances in Materials Science and Engineering, 9931653. https://doi.org/10.1155/amse/9931653
Mordor Intelligence (2025). Aerospace and Defense Composites Market – Size & Forecast 2025–2030. https://www.mordorintelligence.com/industry-reports/aerospace-and-defense-composites-market
Wang et al. (2025). Carbon Fiber Reinforced Thermoplastics: From Materials to Manufacturing and Applications. Advanced Materials. https://advanced.onlinelibrary.wiley.com/doi/10.1002/adma.202418709
Ozturk, F. et al. (2024). Recent advancements in thermoplastic composite materials in aerospace industry. Journal of Thermoplastic Composite Materials. https://journals.sagepub.com/doi/10.1177/08927057231222820
TUM / Composites Part A (2024). Recycling methods for CFRTP. https://mediatum.ub.tum.de/doc/1747345