Trillion-Dollar Low-Altitude Economy Trend Emerges! What Innovative Plastics Are Suitable?

The low-altitude economy has now become a booming sector. Drones, once regarded merely as high-end toys, are now being widely deployed in areas such as agricultural and forestry plant protection, terrain surveying, urban logistics and delivery, and emergency rescue and disaster relief. Their application boundaries continue to expand, and various low-altitude economic scenarios may see explosive growth in the future.

From the perspective of material applications, the operating conditions of low-altitude aircraft are complex and the scenarios are diverse, making it difficult for any single base material to meet all requirements.

This article combines the practical experience of more than ten senior R&D engineers and, with reference to the Low-Altitude Economy Scenario White Paper published by the Chinese Society of Aeronautics and Astronautics, provides an in-depth analysis of material selection logic for different application scenarios in the low-altitude economy, and reviews the characteristics of various high-quality plastics and metal materials suitable for the low-altitude sector.

Material selection for unmanned aerial vehicles (UAVs), eVTOLs and other low-altitude aircraft—whether for carrying people, carrying cargo, logistics transportation, tourism and sightseeing, or agricultural and forestry operations—must simultaneously satisfy seven core criteria: lightweight, high strength and high stiffness with impact resistance, wide-temperature-range weatherability (−40°C to 80°C), resistance to oil and salt-spray corrosion, ease of machining and assembly, compliance with UL94 V-0/V-2 flame-retardant standards, and controllable cost.

Traditional metal materials

In the early low-altitude sector, metallic materials were the mainstream, with representative materials including aluminum alloys and titanium alloys.

Aluminum alloy: a benchmark for metal lightweighting, with a density of only 2.7 g/cm³, which is 30%-50% lighter than steel; it has good corrosion resistance and can serve for a long time after surface treatment, excellent processing performance, and high cost-effectiveness.

Titanium alloy: a high-performance special material with a tensile strength exceeding 1200 MPa, stable mechanical properties at high temperatures, and excellent resistance to acid, alkali, and salt spray corrosion.

However, metal materials also have significant drawbacks: titanium alloys are extremely expensive and difficult to process; their overall weight is relatively high, which reduces aircraft endurance and flight agility, making them difficult to adapt to the ultra-lightweight, high-mobility requirements of low-altitude economy development.

Mainstream innovative plastic substrates

Thanks to their inherent advantages of low density and lightweight design, various modified plastics have become core materials for low-altitude aircraft as substitutes for metal, with different plastics positioned for different performance requirements.

Based on the low-altitude economic scenario matrix, select three high-frequency scenarios: agriculture and forestry, transportation, and marine environmental monitoring, and outline precise material selection plans.

Scene 1: Low-altitude Operations in Agriculture and Forestry

Covers scenarios such as crop transportation, sowing inspection, aerial pesticide spraying, forest fire patrol, and fish fry delivery in aquaculture; the key material requirements are resistance to heat and humidity as well as corrosion from chemical pesticides.

Airframe structure, spray support frame, and other load-bearing structural components:

Spray nozzle, pesticide pipeline, storage container.

Using PPS-GF40 in combination with titanium alloy lining, leveraging the high-temperature resistance and corrosion resistance of PPS, supplemented by the titanium alloy to prevent pesticide penetration, thereby extending service life.

Lightweight internal components (control panels, cockpit interior trim, lining panels)

Scenario 2: Low-altitude transportation

It includes scenarios such as passenger transportation, cargo delivery, aerial surveying and mapping, and emergency rescue operations. The core material requirements are ultra-lightweight, high rigidity and high strength, impact resistance, and high structural stability.

Main load-bearing components such as the fuselage primary frame and landing gear:

Dashboard, hatch hinge, precision connectors.

High-speed moving components such as rotor shafts and transmission gears:

PEEK-CF40 substrate with a titanium alloy coating, combining wear resistance and vibration damping, high-temperature resistance, and surface hardness.

Porthole, camera protective cover:

Using transparent impact-resistant PC to ensure clear aerial photography and monitoring visibility.

Scenario 3: Marine Environmental Monitoring

Long-term exposure to salt spray, high humidity, and seawater corrosion environments; the key material requirements are resistance to salt spray and seawater corrosion, weather and temperature resistance, and strong sealing stability.

Sensor housing, external brackets, buoy, and other exposed components.

Data Sealing Cabin, Core Monitoring Component

PEEK-CF40 is adopted for its creep resistance and low moisture absorption, preventing performance degradation in high-humidity environments and making it suitable for long-life precision instruments.

Precision Instrument Sealing Chamber

PPO/PS alloy is paired with a titanium alloy frame. The alloy is resistant to seawater corrosion, while the titanium alloy provides rigid support to prevent deformation of the cabin body.

Engine housing, high-temperature area of exhaust pipe.

The PPS-GF40 substrate paired with titanium alloy fasteners prevents connection failures caused by metal corrosion.

Scenario Material Selection Summary

Cost-sensitive (agricultural and forestry operations): based on PA6-GF30 + aluminum alloy, with PPS-GF40 and titanium alloy used only at key pesticide corrosion-prone points.

Performance-priority (rescue transport): The core load-bearing structure adopts a titanium alloy + PEEK-CF40 combination, balancing lightweight design and extreme strength.

Extreme-environment type (marine monitoring): Long-term submerged components must use titanium alloy, combined with PPO/PS alloy and anodized aluminum alloy to control overall costs.

Industry-standard material selection approach: adopt a combination model of low-cost base materials and high-performance materials in critical areas; performance and cost can also be optimally balanced through metal-plastic composite structures, such as embedding titanium alloy reinforcing ribs within a plastic frame.

In addition to the conventional three major application scenarios, harsh operating conditions such as extreme polar cold, desert high temperatures, wetland high humidity, and medical disinfection, as well as industry trends toward thinner walls and extreme lightweighting, have placed even higher demands on materials, giving rise to a range of new modified materials.

Extreme cold environment (-60℃ to 0℃)

Pain points: material embrittlement at low temperatures, a sharp decline in toughness, and easy cracking at interfaces.

Desert high-temperature environment (above 60°C)

Pain points: material softening at high temperatures, UV aging, and severe sand abrasion.

Trend toward ultra-thin walls

Traditional materials in thin-walled forming are prone to issues such as warping, insufficient strength, and appearance defects. Blade plastic has become the optimal solution.

Through molecular structure optimization and a specialized reinforcement formulation, it maintains high flexural strength and impact resistance even in thin-wall conditions, enabling ultra-thin product designs while reducing material usage and weight, and simultaneously balancing mechanical performance with an attractive appearance and premium feel.

Extreme Lightweight Trend

Compared with traditional plastics, microcellular nitrogen-foamed PPA (PPA-MF) achieves more than 50% weight reduction. With a density as low as 0.6 g/cm³ and a closed-cell structure that is waterproof and moisture-resistant, it can be used in components such as pontoons for water rescue drones.

As low-altitude economy scenarios continue to expand, various high-performance modified plastics and composite new materials are also continuously evolving, and will continue to support the lightweighting, high durability, and cost reduction of aircraft.