At the crossroads of global manufacturing’s march toward carbon neutrality and intelligentization, the depth of application of non-metallic materials is becoming a core yardstick for measuring industrial advancement. With the boom in new energy vehicles, humanoid robots, and high-performance battery industries, innovation on the materials side is no longer merely about reducing weight—it is evolving into system-level solutions that integrate structural support, electrical insulation, thermal management, and design freedom. Non-metallic materials are reshaping value distribution across the industrial chain through “replacing steel with plastics” and “part integration,” and their current application status and future development trends merit attention.
Industry trends: from “lightweighting” to “system-level substitution”
The automotive sector is one of the largest application markets for non-metallic composite materials. On one hand, reducing the weight of a new energy vehicle by 10%–15% can significantly improve range and optimize battery efficiency. At the same time, compared with metals, composites generate lower carbon emissions during production and have better recyclability potential, which gives them a natural advantage in responding to global green trade barriers.
In the humanoid-robot sector, non-metallic materials are opening up a new paradigm of “high performance, ultra-lightweight.” As design updates to Tesla Optimus have made “PEEK(PolyEtherEtherKetone) + carbon fiber replacing metal” a hot topic, the non-metallic material usage per unit is expected to reach 10–15 kilograms, and a potential incremental market on the order of tens of thousands of tons is taking shape.
Application status: a materials contest across multiple dimensions
In the automotive sector, material selection is not only a competition of technical parameters, but also a deep game around “cost–performance–refinement/premium feel.”
According to the BCC Research Database, the current global market size for composite materials used in battery components has reached USD 73.0 billion. Battery pack enclosures for new energy vehicles have become the largest single application field for composites, accounting for as much as two-thirds by value. Glass-fiber composites (represented by LGFPP) hold a 50%–60% share, while carbon-fiber composites (typically compounded with engineering plastics such as PA6, PA66, or PC/ABS) account for 15%–20%. Among them, LGFPP, thanks to its integrated molding technology, can effectively replace traditional metal housings; and because composites have inherent insulating properties, they can eliminate the insulation-coating process required by metal housings, thereby reducing costs at the system level.
In automotive structural parts, applications of non-metallic materials cover scenarios such as center consoles, seats, headliners, doors, transmission devices, and more, achieving 25%–40% weight reduction. For example, the center console shifting from traditional aluminum alloy to ABS or nylon composite materials has become a widely adopted but non-typical metal-substitution scenario; seat brackets made with PPGF or PPCF materials are 35%–40% lighter than metal materials; carbon-fiber-reinforced composites (CFRP) have formed scaled applications in door-frame skeletons and roof fabric substitution. According to the BCC Research Database, the metal-substitution rate for door-frame brackets, A-pillar and B-pillar brackets, and seat skeletons reaches 30%–40%.
Different from the performance orientation of structural parts, automotive exterior parts (such as bumpers, tailgates, and rearview mirrors) are more constrained by styling freedom and after-sales repair costs. For instance, replacing a sheet-metal tailgate with a plastic tailgate that integrates lighting functions is mainly applied to models priced above CNY 200,000 (≈USD 28,820) and has gradually expanded from SUVs to some sedans, with market penetration exceeding 30%. The core issues hindering further rollout are cost and repairability: the unit cost of a plastic tailgate is significantly higher than the corresponding sheet-metal part by 3–4 times, and after a collision it usually cannot be repaired and must be replaced as a whole, resulting in high after-sales repair costs. Replacing traditional glass with PC plastic for panoramic roofs and windows can reduce weight by 30%–50%, and can also simplify processes such as photochromic implementation, while offering lower thermal conductivity to improve whole-vehicle thermal management. However, this process requires two steps—high-tonnage injection molding and surface hardening. The replacement cost for panoramic-roof glass may be on par with some high-end silver-coated glass; the cost for the rear windshield is 1 to 1.5 times higher; and for smaller side windows or triangular windows the cost is 2 to 3 times higher—so there remains a certain gap to achieve large-area mass production.
Humanoid robots have extremely high requirements for lightweighting.
PEEK (polyether ether ketone), due to its self-lubrication, high-temperature resistance, high strength, and corrosion resistance, is known as a “hexagon warrior” (well-rounded top performer). The per-unit usage is about 6–7 kilograms (for full-size humanoid robots), mainly used in load-bearing structures such as robotic arms and leg frames, transmission components at elbow joints, and some parts requiring extremely high modulus (such as main power bearings).
Although PEEK’s performance is outstanding, its price—up to CNY 300–1,000 per kilogram (≈USD 43.23–144.10 per kilogram)—limits its level of adoption. For this reason, on the one hand, carbon-fiber/PEEK compounding is used to reduce cost while meeting performance requirements; on the other hand, some BCC interviewed experts believe PPS (polyphenylene sulfide) and PPA (high-temperature nylon) have become the first-choice options for practical deployment.
PPS is called the “economy version of PEEK.” Its strength is even higher than PEEK, and it has excellent chemical resistance. Although its toughness, impact strength, and temperature resistance are slightly inferior to PEEK, its price is only about one-tenth. Meanwhile, PPA, through glass-fiber modification, can achieve strength exceeding PEEK and PPS, and it has low density—allowing more parts to be made with less material. Its price is similar to PPS; its only drawback is poor water resistance—long-term use in high-temperature, high-humidity environments can easily lead to dimensional deformation.
In addition, the bionic needs of humanoid robots have given rise to demand for electronic-skin materials. TPU (thermoplastic polyurethane) and silicone rubber are used to simulate human touch and soft overmolding; PI (polyimide) is irreplaceable in display screens and certain electronic-skin sensors, but due to its high price, it is being replaced by materials such as TPO in non-core areas.
Future outlook: expectations for an explosive phase and “certification first”
According to the BCC Research Database, in the automotive sector, the most significant growth prospects over the next three years, in order, are battery pack enclosures, chassis drivetrain systems, and engine peripheral components; in non-automotive sectors, humanoid robots and industrial components are driving demand growth for new composite materials.
Because humanoid robots start from a smaller base, they have strong market potential. With 2025 serving as a period of technical accumulation and scenario validation, 2026 will enter an explosive growth phase as costs are further compressed. By 2028, the overall penetration rate of non-metallic materials in the robotics sector is expected to rise from the current 25% to above 40%.
For non-metallic material manufacturers participating in market competition, mass-production consistency will be the key determinant of survival of the fittest. The gap between laboratory data and large-scale production yield rates (which must reach 95%–96%) will distinguish the true first tier. On the other hand, expanding internationally in non-metallic materials emphasizes “certification.” For example, the IATF 16949 certification cycle can take as long as 2–3 years, and bio-based certification and green recycling certification that respond to carbon-circulation requirements both require relevant companies to plan ahead.
Beyond this, the influence of non-metallic materials is penetrating deeply into fields such as communications, energy, healthcare, and aerospace. Components in communications equipment that achieve electromagnetic regulation and heat dissipation—such as antenna systems and base-station radomes; material substitutions in new energy power-generation components—such as photovoltaic brackets and wind-turbine blade materials; replacements in the medical field for implantable consumables; and in aerospace for high-temperature-resistant engine bay doors and blade substitutions—all reflect the pursuit of extreme performance.
[Disclaimer]: The above content reflects analysis of publicly available information, expert insights, and BCC research. It does not constitute investment advice. BCC is not responsible for any losses resulting from reliance on the views expressed herein. Investors should exercise caution.